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[git/dscho.git] / diff.c
blob374ecf3b486e218c52f94ba14481a715c19b80db
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18
19 #ifdef NO_FAST_WORKING_DIRECTORY
20 #define FAST_WORKING_DIRECTORY 0
21 #else
22 #define FAST_WORKING_DIRECTORY 1
23 #endif
24
25 static int diff_detect_rename_default;
26 static int diff_rename_limit_default = 400;
27 static int diff_suppress_blank_empty;
28 int diff_use_color_default = -1;
29 static const char *diff_word_regex_cfg;
30 static const char *external_diff_cmd_cfg;
31 int diff_auto_refresh_index = 1;
32 static int diff_mnemonic_prefix;
33 static int diff_no_prefix;
34 static int diff_dirstat_permille_default = 30;
35 static struct diff_options default_diff_options;
36
37 static char diff_colors[][COLOR_MAXLEN] = {
38 GIT_COLOR_RESET,
39 GIT_COLOR_NORMAL, /* PLAIN */
40 GIT_COLOR_BOLD, /* METAINFO */
41 GIT_COLOR_CYAN, /* FRAGINFO */
42 GIT_COLOR_RED, /* OLD */
43 GIT_COLOR_GREEN, /* NEW */
44 GIT_COLOR_YELLOW, /* COMMIT */
45 GIT_COLOR_BG_RED, /* WHITESPACE */
46 GIT_COLOR_NORMAL, /* FUNCINFO */
47 };
48
49 static int parse_diff_color_slot(const char *var, int ofs)
50 {
51 if (!strcasecmp(var+ofs, "plain"))
52 return DIFF_PLAIN;
53 if (!strcasecmp(var+ofs, "meta"))
54 return DIFF_METAINFO;
55 if (!strcasecmp(var+ofs, "frag"))
56 return DIFF_FRAGINFO;
57 if (!strcasecmp(var+ofs, "old"))
58 return DIFF_FILE_OLD;
59 if (!strcasecmp(var+ofs, "new"))
60 return DIFF_FILE_NEW;
61 if (!strcasecmp(var+ofs, "commit"))
62 return DIFF_COMMIT;
63 if (!strcasecmp(var+ofs, "whitespace"))
64 return DIFF_WHITESPACE;
65 if (!strcasecmp(var+ofs, "func"))
66 return DIFF_FUNCINFO;
67 return -1;
68 }
69
70 static int parse_dirstat_params(struct diff_options *options, const char *params,
71 struct strbuf *errmsg)
72 {
73 const char *p = params;
74 int p_len, ret = 0;
75
76 while (*p) {
77 p_len = strchrnul(p, ',') - p;
78 if (!memcmp(p, "changes", p_len)) {
79 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
80 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
81 } else if (!memcmp(p, "lines", p_len)) {
82 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
83 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
84 } else if (!memcmp(p, "files", p_len)) {
85 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
86 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
87 } else if (!memcmp(p, "noncumulative", p_len)) {
88 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
89 } else if (!memcmp(p, "cumulative", p_len)) {
90 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
91 } else if (isdigit(*p)) {
92 char *end;
93 int permille = strtoul(p, &end, 10) * 10;
94 if (*end == '.' && isdigit(*++end)) {
95 /* only use first digit */
96 permille += *end - '0';
97 /* .. and ignore any further digits */
98 while (isdigit(*++end))
99 ; /* nothing */
100 }
101 if (end - p == p_len)
102 options->dirstat_permille = permille;
103 else {
104 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%.*s'\n"),
105 p_len, p);
106 ret++;
107 }
108 } else {
109 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%.*s'\n"),
110 p_len, p);
111 ret++;
112 }
113
114 p += p_len;
115
116 if (*p)
117 p++; /* more parameters, swallow separator */
118 }
119 return ret;
120 }
121
122 static int git_config_rename(const char *var, const char *value)
123 {
124 if (!value)
125 return DIFF_DETECT_RENAME;
126 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
127 return DIFF_DETECT_COPY;
128 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
129 }
130
131 /*
132 * These are to give UI layer defaults.
133 * The core-level commands such as git-diff-files should
134 * never be affected by the setting of diff.renames
135 * the user happens to have in the configuration file.
136 */
137 int git_diff_ui_config(const char *var, const char *value, void *cb)
138 {
139 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
140 diff_use_color_default = git_config_colorbool(var, value);
141 return 0;
142 }
143 if (!strcmp(var, "diff.renames")) {
144 diff_detect_rename_default = git_config_rename(var, value);
145 return 0;
146 }
147 if (!strcmp(var, "diff.autorefreshindex")) {
148 diff_auto_refresh_index = git_config_bool(var, value);
149 return 0;
150 }
151 if (!strcmp(var, "diff.mnemonicprefix")) {
152 diff_mnemonic_prefix = git_config_bool(var, value);
153 return 0;
154 }
155 if (!strcmp(var, "diff.noprefix")) {
156 diff_no_prefix = git_config_bool(var, value);
157 return 0;
158 }
159 if (!strcmp(var, "diff.external"))
160 return git_config_string(&external_diff_cmd_cfg, var, value);
161 if (!strcmp(var, "diff.wordregex"))
162 return git_config_string(&diff_word_regex_cfg, var, value);
163
164 if (!strcmp(var, "diff.ignoresubmodules"))
165 handle_ignore_submodules_arg(&default_diff_options, value);
166
167 if (git_color_config(var, value, cb) < 0)
168 return -1;
169
170 return git_diff_basic_config(var, value, cb);
171 }
172
173 int git_diff_basic_config(const char *var, const char *value, void *cb)
174 {
175 if (!strcmp(var, "diff.renamelimit")) {
176 diff_rename_limit_default = git_config_int(var, value);
177 return 0;
178 }
179
180 switch (userdiff_config(var, value)) {
181 case 0: break;
182 case -1: return -1;
183 default: return 0;
184 }
185
186 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
187 int slot = parse_diff_color_slot(var, 11);
188 if (slot < 0)
189 return 0;
190 if (!value)
191 return config_error_nonbool(var);
192 color_parse(value, var, diff_colors[slot]);
193 return 0;
194 }
195
196 /* like GNU diff's --suppress-blank-empty option */
197 if (!strcmp(var, "diff.suppressblankempty") ||
198 /* for backwards compatibility */
199 !strcmp(var, "diff.suppress-blank-empty")) {
200 diff_suppress_blank_empty = git_config_bool(var, value);
201 return 0;
202 }
203
204 if (!strcmp(var, "diff.dirstat")) {
205 struct strbuf errmsg = STRBUF_INIT;
206 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
207 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
208 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
209 errmsg.buf);
210 strbuf_release(&errmsg);
211 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
212 return 0;
213 }
214
215 if (!prefixcmp(var, "submodule."))
216 return parse_submodule_config_option(var, value);
217
218 return git_default_config(var, value, cb);
219 }
220
221 static char *quote_two(const char *one, const char *two)
222 {
223 int need_one = quote_c_style(one, NULL, NULL, 1);
224 int need_two = quote_c_style(two, NULL, NULL, 1);
225 struct strbuf res = STRBUF_INIT;
226
227 if (need_one + need_two) {
228 strbuf_addch(&res, '"');
229 quote_c_style(one, &res, NULL, 1);
230 quote_c_style(two, &res, NULL, 1);
231 strbuf_addch(&res, '"');
232 } else {
233 strbuf_addstr(&res, one);
234 strbuf_addstr(&res, two);
235 }
236 return strbuf_detach(&res, NULL);
237 }
238
239 static const char *external_diff(void)
240 {
241 static const char *external_diff_cmd = NULL;
242 static int done_preparing = 0;
243
244 if (done_preparing)
245 return external_diff_cmd;
246 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
247 if (!external_diff_cmd)
248 external_diff_cmd = external_diff_cmd_cfg;
249 done_preparing = 1;
250 return external_diff_cmd;
251 }
252
253 static struct diff_tempfile {
254 const char *name; /* filename external diff should read from */
255 char hex[41];
256 char mode[10];
257 char tmp_path[PATH_MAX];
258 } diff_temp[2];
259
260 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
261
262 struct emit_callback {
263 int color_diff;
264 unsigned ws_rule;
265 int blank_at_eof_in_preimage;
266 int blank_at_eof_in_postimage;
267 int lno_in_preimage;
268 int lno_in_postimage;
269 sane_truncate_fn truncate;
270 const char **label_path;
271 struct diff_words_data *diff_words;
272 struct diff_options *opt;
273 int *found_changesp;
274 struct strbuf *header;
275 };
276
277 static int count_lines(const char *data, int size)
278 {
279 int count, ch, completely_empty = 1, nl_just_seen = 0;
280 count = 0;
281 while (0 < size--) {
282 ch = *data++;
283 if (ch == '\n') {
284 count++;
285 nl_just_seen = 1;
286 completely_empty = 0;
287 }
288 else {
289 nl_just_seen = 0;
290 completely_empty = 0;
291 }
292 }
293 if (completely_empty)
294 return 0;
295 if (!nl_just_seen)
296 count++; /* no trailing newline */
297 return count;
298 }
299
300 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
301 {
302 if (!DIFF_FILE_VALID(one)) {
303 mf->ptr = (char *)""; /* does not matter */
304 mf->size = 0;
305 return 0;
306 }
307 else if (diff_populate_filespec(one, 0))
308 return -1;
309
310 mf->ptr = one->data;
311 mf->size = one->size;
312 return 0;
313 }
314
315 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
316 static unsigned long diff_filespec_size(struct diff_filespec *one)
317 {
318 if (!DIFF_FILE_VALID(one))
319 return 0;
320 diff_populate_filespec(one, 1);
321 return one->size;
322 }
323
324 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
325 {
326 char *ptr = mf->ptr;
327 long size = mf->size;
328 int cnt = 0;
329
330 if (!size)
331 return cnt;
332 ptr += size - 1; /* pointing at the very end */
333 if (*ptr != '\n')
334 ; /* incomplete line */
335 else
336 ptr--; /* skip the last LF */
337 while (mf->ptr < ptr) {
338 char *prev_eol;
339 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
340 if (*prev_eol == '\n')
341 break;
342 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
343 break;
344 cnt++;
345 ptr = prev_eol - 1;
346 }
347 return cnt;
348 }
349
350 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
351 struct emit_callback *ecbdata)
352 {
353 int l1, l2, at;
354 unsigned ws_rule = ecbdata->ws_rule;
355 l1 = count_trailing_blank(mf1, ws_rule);
356 l2 = count_trailing_blank(mf2, ws_rule);
357 if (l2 <= l1) {
358 ecbdata->blank_at_eof_in_preimage = 0;
359 ecbdata->blank_at_eof_in_postimage = 0;
360 return;
361 }
362 at = count_lines(mf1->ptr, mf1->size);
363 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
364
365 at = count_lines(mf2->ptr, mf2->size);
366 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
367 }
368
369 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
370 int first, const char *line, int len)
371 {
372 int has_trailing_newline, has_trailing_carriage_return;
373 int nofirst;
374 FILE *file = o->file;
375
376 if (o->output_prefix) {
377 struct strbuf *msg = NULL;
378 msg = o->output_prefix(o, o->output_prefix_data);
379 assert(msg);
380 fwrite(msg->buf, msg->len, 1, file);
381 }
382
383 if (len == 0) {
384 has_trailing_newline = (first == '\n');
385 has_trailing_carriage_return = (!has_trailing_newline &&
386 (first == '\r'));
387 nofirst = has_trailing_newline || has_trailing_carriage_return;
388 } else {
389 has_trailing_newline = (len > 0 && line[len-1] == '\n');
390 if (has_trailing_newline)
391 len--;
392 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
393 if (has_trailing_carriage_return)
394 len--;
395 nofirst = 0;
396 }
397
398 if (len || !nofirst) {
399 fputs(set, file);
400 if (!nofirst)
401 fputc(first, file);
402 fwrite(line, len, 1, file);
403 fputs(reset, file);
404 }
405 if (has_trailing_carriage_return)
406 fputc('\r', file);
407 if (has_trailing_newline)
408 fputc('\n', file);
409 }
410
411 static void emit_line(struct diff_options *o, const char *set, const char *reset,
412 const char *line, int len)
413 {
414 emit_line_0(o, set, reset, line[0], line+1, len-1);
415 }
416
417 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
418 {
419 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
420 ecbdata->blank_at_eof_in_preimage &&
421 ecbdata->blank_at_eof_in_postimage &&
422 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
423 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
424 return 0;
425 return ws_blank_line(line, len, ecbdata->ws_rule);
426 }
427
428 static void emit_add_line(const char *reset,
429 struct emit_callback *ecbdata,
430 const char *line, int len)
431 {
432 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
433 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
434
435 if (!*ws)
436 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
437 else if (new_blank_line_at_eof(ecbdata, line, len))
438 /* Blank line at EOF - paint '+' as well */
439 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
440 else {
441 /* Emit just the prefix, then the rest. */
442 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
443 ws_check_emit(line, len, ecbdata->ws_rule,
444 ecbdata->opt->file, set, reset, ws);
445 }
446 }
447
448 static void emit_hunk_header(struct emit_callback *ecbdata,
449 const char *line, int len)
450 {
451 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
452 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
453 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
454 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
455 static const char atat[2] = { '@', '@' };
456 const char *cp, *ep;
457 struct strbuf msgbuf = STRBUF_INIT;
458 int org_len = len;
459 int i = 1;
460
461 /*
462 * As a hunk header must begin with "@@ -<old>, +<new> @@",
463 * it always is at least 10 bytes long.
464 */
465 if (len < 10 ||
466 memcmp(line, atat, 2) ||
467 !(ep = memmem(line + 2, len - 2, atat, 2))) {
468 emit_line(ecbdata->opt, plain, reset, line, len);
469 return;
470 }
471 ep += 2; /* skip over @@ */
472
473 /* The hunk header in fraginfo color */
474 strbuf_add(&msgbuf, frag, strlen(frag));
475 strbuf_add(&msgbuf, line, ep - line);
476 strbuf_add(&msgbuf, reset, strlen(reset));
477
478 /*
479 * trailing "\r\n"
480 */
481 for ( ; i < 3; i++)
482 if (line[len - i] == '\r' || line[len - i] == '\n')
483 len--;
484
485 /* blank before the func header */
486 for (cp = ep; ep - line < len; ep++)
487 if (*ep != ' ' && *ep != '\t')
488 break;
489 if (ep != cp) {
490 strbuf_add(&msgbuf, plain, strlen(plain));
491 strbuf_add(&msgbuf, cp, ep - cp);
492 strbuf_add(&msgbuf, reset, strlen(reset));
493 }
494
495 if (ep < line + len) {
496 strbuf_add(&msgbuf, func, strlen(func));
497 strbuf_add(&msgbuf, ep, line + len - ep);
498 strbuf_add(&msgbuf, reset, strlen(reset));
499 }
500
501 strbuf_add(&msgbuf, line + len, org_len - len);
502 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
503 strbuf_release(&msgbuf);
504 }
505
506 static struct diff_tempfile *claim_diff_tempfile(void) {
507 int i;
508 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
509 if (!diff_temp[i].name)
510 return diff_temp + i;
511 die("BUG: diff is failing to clean up its tempfiles");
512 }
513
514 static int remove_tempfile_installed;
515
516 static void remove_tempfile(void)
517 {
518 int i;
519 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
520 if (diff_temp[i].name == diff_temp[i].tmp_path)
521 unlink_or_warn(diff_temp[i].name);
522 diff_temp[i].name = NULL;
523 }
524 }
525
526 static void remove_tempfile_on_signal(int signo)
527 {
528 remove_tempfile();
529 sigchain_pop(signo);
530 raise(signo);
531 }
532
533 static void print_line_count(FILE *file, int count)
534 {
535 switch (count) {
536 case 0:
537 fprintf(file, "0,0");
538 break;
539 case 1:
540 fprintf(file, "1");
541 break;
542 default:
543 fprintf(file, "1,%d", count);
544 break;
545 }
546 }
547
548 static void emit_rewrite_lines(struct emit_callback *ecb,
549 int prefix, const char *data, int size)
550 {
551 const char *endp = NULL;
552 static const char *nneof = " No newline at end of file\n";
553 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
554 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
555
556 while (0 < size) {
557 int len;
558
559 endp = memchr(data, '\n', size);
560 len = endp ? (endp - data + 1) : size;
561 if (prefix != '+') {
562 ecb->lno_in_preimage++;
563 emit_line_0(ecb->opt, old, reset, '-',
564 data, len);
565 } else {
566 ecb->lno_in_postimage++;
567 emit_add_line(reset, ecb, data, len);
568 }
569 size -= len;
570 data += len;
571 }
572 if (!endp) {
573 const char *plain = diff_get_color(ecb->color_diff,
574 DIFF_PLAIN);
575 emit_line_0(ecb->opt, plain, reset, '\\',
576 nneof, strlen(nneof));
577 }
578 }
579
580 static void emit_rewrite_diff(const char *name_a,
581 const char *name_b,
582 struct diff_filespec *one,
583 struct diff_filespec *two,
584 struct userdiff_driver *textconv_one,
585 struct userdiff_driver *textconv_two,
586 struct diff_options *o)
587 {
588 int lc_a, lc_b;
589 const char *name_a_tab, *name_b_tab;
590 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
591 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
592 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
593 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
594 const char *a_prefix, *b_prefix;
595 char *data_one, *data_two;
596 size_t size_one, size_two;
597 struct emit_callback ecbdata;
598 char *line_prefix = "";
599 struct strbuf *msgbuf;
600
601 if (o && o->output_prefix) {
602 msgbuf = o->output_prefix(o, o->output_prefix_data);
603 line_prefix = msgbuf->buf;
604 }
605
606 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
607 a_prefix = o->b_prefix;
608 b_prefix = o->a_prefix;
609 } else {
610 a_prefix = o->a_prefix;
611 b_prefix = o->b_prefix;
612 }
613
614 name_a += (*name_a == '/');
615 name_b += (*name_b == '/');
616 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
617 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
618
619 strbuf_reset(&a_name);
620 strbuf_reset(&b_name);
621 quote_two_c_style(&a_name, a_prefix, name_a, 0);
622 quote_two_c_style(&b_name, b_prefix, name_b, 0);
623
624 size_one = fill_textconv(textconv_one, one, &data_one);
625 size_two = fill_textconv(textconv_two, two, &data_two);
626
627 memset(&ecbdata, 0, sizeof(ecbdata));
628 ecbdata.color_diff = want_color(o->use_color);
629 ecbdata.found_changesp = &o->found_changes;
630 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
631 ecbdata.opt = o;
632 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
633 mmfile_t mf1, mf2;
634 mf1.ptr = (char *)data_one;
635 mf2.ptr = (char *)data_two;
636 mf1.size = size_one;
637 mf2.size = size_two;
638 check_blank_at_eof(&mf1, &mf2, &ecbdata);
639 }
640 ecbdata.lno_in_preimage = 1;
641 ecbdata.lno_in_postimage = 1;
642
643 lc_a = count_lines(data_one, size_one);
644 lc_b = count_lines(data_two, size_two);
645 fprintf(o->file,
646 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
647 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
648 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
649 line_prefix, fraginfo);
650 if (!o->irreversible_delete)
651 print_line_count(o->file, lc_a);
652 else
653 fprintf(o->file, "?,?");
654 fprintf(o->file, " +");
655 print_line_count(o->file, lc_b);
656 fprintf(o->file, " @@%s\n", reset);
657 if (lc_a && !o->irreversible_delete)
658 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
659 if (lc_b)
660 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
661 if (textconv_one)
662 free((char *)data_one);
663 if (textconv_two)
664 free((char *)data_two);
665 }
666
667 struct diff_words_buffer {
668 mmfile_t text;
669 long alloc;
670 struct diff_words_orig {
671 const char *begin, *end;
672 } *orig;
673 int orig_nr, orig_alloc;
674 };
675
676 static void diff_words_append(char *line, unsigned long len,
677 struct diff_words_buffer *buffer)
678 {
679 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
680 line++;
681 len--;
682 memcpy(buffer->text.ptr + buffer->text.size, line, len);
683 buffer->text.size += len;
684 buffer->text.ptr[buffer->text.size] = '\0';
685 }
686
687 struct diff_words_style_elem {
688 const char *prefix;
689 const char *suffix;
690 const char *color; /* NULL; filled in by the setup code if
691 * color is enabled */
692 };
693
694 struct diff_words_style {
695 enum diff_words_type type;
696 struct diff_words_style_elem new, old, ctx;
697 const char *newline;
698 };
699
700 static struct diff_words_style diff_words_styles[] = {
701 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
702 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
703 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
704 };
705
706 struct diff_words_data {
707 struct diff_words_buffer minus, plus;
708 const char *current_plus;
709 int last_minus;
710 struct diff_options *opt;
711 regex_t *word_regex;
712 enum diff_words_type type;
713 struct diff_words_style *style;
714 };
715
716 static int fn_out_diff_words_write_helper(FILE *fp,
717 struct diff_words_style_elem *st_el,
718 const char *newline,
719 size_t count, const char *buf,
720 const char *line_prefix)
721 {
722 int print = 0;
723
724 while (count) {
725 char *p = memchr(buf, '\n', count);
726 if (print)
727 fputs(line_prefix, fp);
728 if (p != buf) {
729 if (st_el->color && fputs(st_el->color, fp) < 0)
730 return -1;
731 if (fputs(st_el->prefix, fp) < 0 ||
732 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
733 fputs(st_el->suffix, fp) < 0)
734 return -1;
735 if (st_el->color && *st_el->color
736 && fputs(GIT_COLOR_RESET, fp) < 0)
737 return -1;
738 }
739 if (!p)
740 return 0;
741 if (fputs(newline, fp) < 0)
742 return -1;
743 count -= p + 1 - buf;
744 buf = p + 1;
745 print = 1;
746 }
747 return 0;
748 }
749
750 /*
751 * '--color-words' algorithm can be described as:
752 *
753 * 1. collect a the minus/plus lines of a diff hunk, divided into
754 * minus-lines and plus-lines;
755 *
756 * 2. break both minus-lines and plus-lines into words and
757 * place them into two mmfile_t with one word for each line;
758 *
759 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
760 *
761 * And for the common parts of the both file, we output the plus side text.
762 * diff_words->current_plus is used to trace the current position of the plus file
763 * which printed. diff_words->last_minus is used to trace the last minus word
764 * printed.
765 *
766 * For '--graph' to work with '--color-words', we need to output the graph prefix
767 * on each line of color words output. Generally, there are two conditions on
768 * which we should output the prefix.
769 *
770 * 1. diff_words->last_minus == 0 &&
771 * diff_words->current_plus == diff_words->plus.text.ptr
772 *
773 * that is: the plus text must start as a new line, and if there is no minus
774 * word printed, a graph prefix must be printed.
775 *
776 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
777 * *(diff_words->current_plus - 1) == '\n'
778 *
779 * that is: a graph prefix must be printed following a '\n'
780 */
781 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
782 {
783 if ((diff_words->last_minus == 0 &&
784 diff_words->current_plus == diff_words->plus.text.ptr) ||
785 (diff_words->current_plus > diff_words->plus.text.ptr &&
786 *(diff_words->current_plus - 1) == '\n')) {
787 return 1;
788 } else {
789 return 0;
790 }
791 }
792
793 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
794 {
795 struct diff_words_data *diff_words = priv;
796 struct diff_words_style *style = diff_words->style;
797 int minus_first, minus_len, plus_first, plus_len;
798 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
799 struct diff_options *opt = diff_words->opt;
800 struct strbuf *msgbuf;
801 char *line_prefix = "";
802
803 if (line[0] != '@' || parse_hunk_header(line, len,
804 &minus_first, &minus_len, &plus_first, &plus_len))
805 return;
806
807 assert(opt);
808 if (opt->output_prefix) {
809 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
810 line_prefix = msgbuf->buf;
811 }
812
813 /* POSIX requires that first be decremented by one if len == 0... */
814 if (minus_len) {
815 minus_begin = diff_words->minus.orig[minus_first].begin;
816 minus_end =
817 diff_words->minus.orig[minus_first + minus_len - 1].end;
818 } else
819 minus_begin = minus_end =
820 diff_words->minus.orig[minus_first].end;
821
822 if (plus_len) {
823 plus_begin = diff_words->plus.orig[plus_first].begin;
824 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
825 } else
826 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
827
828 if (color_words_output_graph_prefix(diff_words)) {
829 fputs(line_prefix, diff_words->opt->file);
830 }
831 if (diff_words->current_plus != plus_begin) {
832 fn_out_diff_words_write_helper(diff_words->opt->file,
833 &style->ctx, style->newline,
834 plus_begin - diff_words->current_plus,
835 diff_words->current_plus, line_prefix);
836 if (*(plus_begin - 1) == '\n')
837 fputs(line_prefix, diff_words->opt->file);
838 }
839 if (minus_begin != minus_end) {
840 fn_out_diff_words_write_helper(diff_words->opt->file,
841 &style->old, style->newline,
842 minus_end - minus_begin, minus_begin,
843 line_prefix);
844 }
845 if (plus_begin != plus_end) {
846 fn_out_diff_words_write_helper(diff_words->opt->file,
847 &style->new, style->newline,
848 plus_end - plus_begin, plus_begin,
849 line_prefix);
850 }
851
852 diff_words->current_plus = plus_end;
853 diff_words->last_minus = minus_first;
854 }
855
856 /* This function starts looking at *begin, and returns 0 iff a word was found. */
857 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
858 int *begin, int *end)
859 {
860 if (word_regex && *begin < buffer->size) {
861 regmatch_t match[1];
862 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
863 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
864 '\n', match[0].rm_eo - match[0].rm_so);
865 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
866 *begin += match[0].rm_so;
867 return *begin >= *end;
868 }
869 return -1;
870 }
871
872 /* find the next word */
873 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
874 (*begin)++;
875 if (*begin >= buffer->size)
876 return -1;
877
878 /* find the end of the word */
879 *end = *begin + 1;
880 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
881 (*end)++;
882
883 return 0;
884 }
885
886 /*
887 * This function splits the words in buffer->text, stores the list with
888 * newline separator into out, and saves the offsets of the original words
889 * in buffer->orig.
890 */
891 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
892 regex_t *word_regex)
893 {
894 int i, j;
895 long alloc = 0;
896
897 out->size = 0;
898 out->ptr = NULL;
899
900 /* fake an empty "0th" word */
901 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
902 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
903 buffer->orig_nr = 1;
904
905 for (i = 0; i < buffer->text.size; i++) {
906 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
907 return;
908
909 /* store original boundaries */
910 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
911 buffer->orig_alloc);
912 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
913 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
914 buffer->orig_nr++;
915
916 /* store one word */
917 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
918 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
919 out->ptr[out->size + j - i] = '\n';
920 out->size += j - i + 1;
921
922 i = j - 1;
923 }
924 }
925
926 /* this executes the word diff on the accumulated buffers */
927 static void diff_words_show(struct diff_words_data *diff_words)
928 {
929 xpparam_t xpp;
930 xdemitconf_t xecfg;
931 mmfile_t minus, plus;
932 struct diff_words_style *style = diff_words->style;
933
934 struct diff_options *opt = diff_words->opt;
935 struct strbuf *msgbuf;
936 char *line_prefix = "";
937
938 assert(opt);
939 if (opt->output_prefix) {
940 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
941 line_prefix = msgbuf->buf;
942 }
943
944 /* special case: only removal */
945 if (!diff_words->plus.text.size) {
946 fputs(line_prefix, diff_words->opt->file);
947 fn_out_diff_words_write_helper(diff_words->opt->file,
948 &style->old, style->newline,
949 diff_words->minus.text.size,
950 diff_words->minus.text.ptr, line_prefix);
951 diff_words->minus.text.size = 0;
952 return;
953 }
954
955 diff_words->current_plus = diff_words->plus.text.ptr;
956 diff_words->last_minus = 0;
957
958 memset(&xpp, 0, sizeof(xpp));
959 memset(&xecfg, 0, sizeof(xecfg));
960 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
961 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
962 xpp.flags = 0;
963 /* as only the hunk header will be parsed, we need a 0-context */
964 xecfg.ctxlen = 0;
965 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
966 &xpp, &xecfg);
967 free(minus.ptr);
968 free(plus.ptr);
969 if (diff_words->current_plus != diff_words->plus.text.ptr +
970 diff_words->plus.text.size) {
971 if (color_words_output_graph_prefix(diff_words))
972 fputs(line_prefix, diff_words->opt->file);
973 fn_out_diff_words_write_helper(diff_words->opt->file,
974 &style->ctx, style->newline,
975 diff_words->plus.text.ptr + diff_words->plus.text.size
976 - diff_words->current_plus, diff_words->current_plus,
977 line_prefix);
978 }
979 diff_words->minus.text.size = diff_words->plus.text.size = 0;
980 }
981
982 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
983 static void diff_words_flush(struct emit_callback *ecbdata)
984 {
985 if (ecbdata->diff_words->minus.text.size ||
986 ecbdata->diff_words->plus.text.size)
987 diff_words_show(ecbdata->diff_words);
988 }
989
990 static void free_diff_words_data(struct emit_callback *ecbdata)
991 {
992 if (ecbdata->diff_words) {
993 diff_words_flush(ecbdata);
994 free (ecbdata->diff_words->minus.text.ptr);
995 free (ecbdata->diff_words->minus.orig);
996 free (ecbdata->diff_words->plus.text.ptr);
997 free (ecbdata->diff_words->plus.orig);
998 if (ecbdata->diff_words->word_regex) {
999 regfree(ecbdata->diff_words->word_regex);
1000 free(ecbdata->diff_words->word_regex);
1001 }
1002 free(ecbdata->diff_words);
1003 ecbdata->diff_words = NULL;
1004 }
1005 }
1006
1007 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1008 {
1009 if (want_color(diff_use_color))
1010 return diff_colors[ix];
1011 return "";
1012 }
1013
1014 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1015 {
1016 const char *cp;
1017 unsigned long allot;
1018 size_t l = len;
1019
1020 if (ecb->truncate)
1021 return ecb->truncate(line, len);
1022 cp = line;
1023 allot = l;
1024 while (0 < l) {
1025 (void) utf8_width(&cp, &l);
1026 if (!cp)
1027 break; /* truncated in the middle? */
1028 }
1029 return allot - l;
1030 }
1031
1032 static void find_lno(const char *line, struct emit_callback *ecbdata)
1033 {
1034 const char *p;
1035 ecbdata->lno_in_preimage = 0;
1036 ecbdata->lno_in_postimage = 0;
1037 p = strchr(line, '-');
1038 if (!p)
1039 return; /* cannot happen */
1040 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1041 p = strchr(p, '+');
1042 if (!p)
1043 return; /* cannot happen */
1044 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1045 }
1046
1047 static void fn_out_consume(void *priv, char *line, unsigned long len)
1048 {
1049 struct emit_callback *ecbdata = priv;
1050 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1051 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1052 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1053 struct diff_options *o = ecbdata->opt;
1054 char *line_prefix = "";
1055 struct strbuf *msgbuf;
1056
1057 if (o && o->output_prefix) {
1058 msgbuf = o->output_prefix(o, o->output_prefix_data);
1059 line_prefix = msgbuf->buf;
1060 }
1061
1062 if (ecbdata->header) {
1063 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1064 strbuf_reset(ecbdata->header);
1065 ecbdata->header = NULL;
1066 }
1067 *(ecbdata->found_changesp) = 1;
1068
1069 if (ecbdata->label_path[0]) {
1070 const char *name_a_tab, *name_b_tab;
1071
1072 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1073 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1074
1075 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1076 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1077 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1078 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1079 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1080 }
1081
1082 if (diff_suppress_blank_empty
1083 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1084 line[0] = '\n';
1085 len = 1;
1086 }
1087
1088 if (line[0] == '@') {
1089 if (ecbdata->diff_words)
1090 diff_words_flush(ecbdata);
1091 len = sane_truncate_line(ecbdata, line, len);
1092 find_lno(line, ecbdata);
1093 emit_hunk_header(ecbdata, line, len);
1094 if (line[len-1] != '\n')
1095 putc('\n', ecbdata->opt->file);
1096 return;
1097 }
1098
1099 if (len < 1) {
1100 emit_line(ecbdata->opt, reset, reset, line, len);
1101 if (ecbdata->diff_words
1102 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1103 fputs("~\n", ecbdata->opt->file);
1104 return;
1105 }
1106
1107 if (ecbdata->diff_words) {
1108 if (line[0] == '-') {
1109 diff_words_append(line, len,
1110 &ecbdata->diff_words->minus);
1111 return;
1112 } else if (line[0] == '+') {
1113 diff_words_append(line, len,
1114 &ecbdata->diff_words->plus);
1115 return;
1116 }
1117 diff_words_flush(ecbdata);
1118 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1119 emit_line(ecbdata->opt, plain, reset, line, len);
1120 fputs("~\n", ecbdata->opt->file);
1121 } else {
1122 /*
1123 * Skip the prefix character, if any. With
1124 * diff_suppress_blank_empty, there may be
1125 * none.
1126 */
1127 if (line[0] != '\n') {
1128 line++;
1129 len--;
1130 }
1131 emit_line(ecbdata->opt, plain, reset, line, len);
1132 }
1133 return;
1134 }
1135
1136 if (line[0] != '+') {
1137 const char *color =
1138 diff_get_color(ecbdata->color_diff,
1139 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1140 ecbdata->lno_in_preimage++;
1141 if (line[0] == ' ')
1142 ecbdata->lno_in_postimage++;
1143 emit_line(ecbdata->opt, color, reset, line, len);
1144 } else {
1145 ecbdata->lno_in_postimage++;
1146 emit_add_line(reset, ecbdata, line + 1, len - 1);
1147 }
1148 }
1149
1150 static char *pprint_rename(const char *a, const char *b)
1151 {
1152 const char *old = a;
1153 const char *new = b;
1154 struct strbuf name = STRBUF_INIT;
1155 int pfx_length, sfx_length;
1156 int len_a = strlen(a);
1157 int len_b = strlen(b);
1158 int a_midlen, b_midlen;
1159 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1160 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1161
1162 if (qlen_a || qlen_b) {
1163 quote_c_style(a, &name, NULL, 0);
1164 strbuf_addstr(&name, " => ");
1165 quote_c_style(b, &name, NULL, 0);
1166 return strbuf_detach(&name, NULL);
1167 }
1168
1169 /* Find common prefix */
1170 pfx_length = 0;
1171 while (*old && *new && *old == *new) {
1172 if (*old == '/')
1173 pfx_length = old - a + 1;
1174 old++;
1175 new++;
1176 }
1177
1178 /* Find common suffix */
1179 old = a + len_a;
1180 new = b + len_b;
1181 sfx_length = 0;
1182 while (a <= old && b <= new && *old == *new) {
1183 if (*old == '/')
1184 sfx_length = len_a - (old - a);
1185 old--;
1186 new--;
1187 }
1188
1189 /*
1190 * pfx{mid-a => mid-b}sfx
1191 * {pfx-a => pfx-b}sfx
1192 * pfx{sfx-a => sfx-b}
1193 * name-a => name-b
1194 */
1195 a_midlen = len_a - pfx_length - sfx_length;
1196 b_midlen = len_b - pfx_length - sfx_length;
1197 if (a_midlen < 0)
1198 a_midlen = 0;
1199 if (b_midlen < 0)
1200 b_midlen = 0;
1201
1202 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1203 if (pfx_length + sfx_length) {
1204 strbuf_add(&name, a, pfx_length);
1205 strbuf_addch(&name, '{');
1206 }
1207 strbuf_add(&name, a + pfx_length, a_midlen);
1208 strbuf_addstr(&name, " => ");
1209 strbuf_add(&name, b + pfx_length, b_midlen);
1210 if (pfx_length + sfx_length) {
1211 strbuf_addch(&name, '}');
1212 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1213 }
1214 return strbuf_detach(&name, NULL);
1215 }
1216
1217 struct diffstat_t {
1218 int nr;
1219 int alloc;
1220 struct diffstat_file {
1221 char *from_name;
1222 char *name;
1223 char *print_name;
1224 unsigned is_unmerged:1;
1225 unsigned is_binary:1;
1226 unsigned is_renamed:1;
1227 uintmax_t added, deleted;
1228 } **files;
1229 };
1230
1231 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1232 const char *name_a,
1233 const char *name_b)
1234 {
1235 struct diffstat_file *x;
1236 x = xcalloc(sizeof (*x), 1);
1237 if (diffstat->nr == diffstat->alloc) {
1238 diffstat->alloc = alloc_nr(diffstat->alloc);
1239 diffstat->files = xrealloc(diffstat->files,
1240 diffstat->alloc * sizeof(x));
1241 }
1242 diffstat->files[diffstat->nr++] = x;
1243 if (name_b) {
1244 x->from_name = xstrdup(name_a);
1245 x->name = xstrdup(name_b);
1246 x->is_renamed = 1;
1247 }
1248 else {
1249 x->from_name = NULL;
1250 x->name = xstrdup(name_a);
1251 }
1252 return x;
1253 }
1254
1255 static void diffstat_consume(void *priv, char *line, unsigned long len)
1256 {
1257 struct diffstat_t *diffstat = priv;
1258 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1259
1260 if (line[0] == '+')
1261 x->added++;
1262 else if (line[0] == '-')
1263 x->deleted++;
1264 }
1265
1266 const char mime_boundary_leader[] = "------------";
1267
1268 static int scale_linear(int it, int width, int max_change)
1269 {
1270 /*
1271 * make sure that at least one '-' is printed if there were deletions,
1272 * and likewise for '+'.
1273 */
1274 if (max_change < 2)
1275 return it;
1276 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
1277 }
1278
1279 static void show_name(FILE *file,
1280 const char *prefix, const char *name, int len)
1281 {
1282 fprintf(file, " %s%-*s |", prefix, len, name);
1283 }
1284
1285 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1286 {
1287 if (cnt <= 0)
1288 return;
1289 fprintf(file, "%s", set);
1290 while (cnt--)
1291 putc(ch, file);
1292 fprintf(file, "%s", reset);
1293 }
1294
1295 static void fill_print_name(struct diffstat_file *file)
1296 {
1297 char *pname;
1298
1299 if (file->print_name)
1300 return;
1301
1302 if (!file->is_renamed) {
1303 struct strbuf buf = STRBUF_INIT;
1304 if (quote_c_style(file->name, &buf, NULL, 0)) {
1305 pname = strbuf_detach(&buf, NULL);
1306 } else {
1307 pname = file->name;
1308 strbuf_release(&buf);
1309 }
1310 } else {
1311 pname = pprint_rename(file->from_name, file->name);
1312 }
1313 file->print_name = pname;
1314 }
1315
1316 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1317 {
1318 int i, len, add, del, adds = 0, dels = 0;
1319 uintmax_t max_change = 0, max_len = 0;
1320 int total_files = data->nr;
1321 int width, name_width, count;
1322 const char *reset, *add_c, *del_c;
1323 const char *line_prefix = "";
1324 int extra_shown = 0;
1325 struct strbuf *msg = NULL;
1326
1327 if (data->nr == 0)
1328 return;
1329
1330 if (options->output_prefix) {
1331 msg = options->output_prefix(options, options->output_prefix_data);
1332 line_prefix = msg->buf;
1333 }
1334
1335 width = options->stat_width ? options->stat_width : 80;
1336 name_width = options->stat_name_width ? options->stat_name_width : 50;
1337 count = options->stat_count ? options->stat_count : data->nr;
1338
1339 /* Sanity: give at least 5 columns to the graph,
1340 * but leave at least 10 columns for the name.
1341 */
1342 if (width < 25)
1343 width = 25;
1344 if (name_width < 10)
1345 name_width = 10;
1346 else if (width < name_width + 15)
1347 name_width = width - 15;
1348
1349 /* Find the longest filename and max number of changes */
1350 reset = diff_get_color_opt(options, DIFF_RESET);
1351 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1352 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1353
1354 for (i = 0; (i < count) && (i < data->nr); i++) {
1355 struct diffstat_file *file = data->files[i];
1356 uintmax_t change = file->added + file->deleted;
1357 if (!data->files[i]->is_renamed &&
1358 (change == 0)) {
1359 count++; /* not shown == room for one more */
1360 continue;
1361 }
1362 fill_print_name(file);
1363 len = strlen(file->print_name);
1364 if (max_len < len)
1365 max_len = len;
1366
1367 if (file->is_binary || file->is_unmerged)
1368 continue;
1369 if (max_change < change)
1370 max_change = change;
1371 }
1372 count = i; /* min(count, data->nr) */
1373
1374 /* Compute the width of the graph part;
1375 * 10 is for one blank at the beginning of the line plus
1376 * " | count " between the name and the graph.
1377 *
1378 * From here on, name_width is the width of the name area,
1379 * and width is the width of the graph area.
1380 */
1381 name_width = (name_width < max_len) ? name_width : max_len;
1382 if (width < (name_width + 10) + max_change)
1383 width = width - (name_width + 10);
1384 else
1385 width = max_change;
1386
1387 for (i = 0; i < count; i++) {
1388 const char *prefix = "";
1389 char *name = data->files[i]->print_name;
1390 uintmax_t added = data->files[i]->added;
1391 uintmax_t deleted = data->files[i]->deleted;
1392 int name_len;
1393
1394 if (!data->files[i]->is_renamed &&
1395 (added + deleted == 0)) {
1396 total_files--;
1397 continue;
1398 }
1399 /*
1400 * "scale" the filename
1401 */
1402 len = name_width;
1403 name_len = strlen(name);
1404 if (name_width < name_len) {
1405 char *slash;
1406 prefix = "...";
1407 len -= 3;
1408 name += name_len - len;
1409 slash = strchr(name, '/');
1410 if (slash)
1411 name = slash;
1412 }
1413
1414 if (data->files[i]->is_binary) {
1415 fprintf(options->file, "%s", line_prefix);
1416 show_name(options->file, prefix, name, len);
1417 fprintf(options->file, " Bin ");
1418 fprintf(options->file, "%s%"PRIuMAX"%s",
1419 del_c, deleted, reset);
1420 fprintf(options->file, " -> ");
1421 fprintf(options->file, "%s%"PRIuMAX"%s",
1422 add_c, added, reset);
1423 fprintf(options->file, " bytes");
1424 fprintf(options->file, "\n");
1425 continue;
1426 }
1427 else if (data->files[i]->is_unmerged) {
1428 fprintf(options->file, "%s", line_prefix);
1429 show_name(options->file, prefix, name, len);
1430 fprintf(options->file, " Unmerged\n");
1431 continue;
1432 }
1433
1434 /*
1435 * scale the add/delete
1436 */
1437 add = added;
1438 del = deleted;
1439 adds += add;
1440 dels += del;
1441
1442 if (width <= max_change) {
1443 add = scale_linear(add, width, max_change);
1444 del = scale_linear(del, width, max_change);
1445 }
1446 fprintf(options->file, "%s", line_prefix);
1447 show_name(options->file, prefix, name, len);
1448 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1449 added + deleted ? " " : "");
1450 show_graph(options->file, '+', add, add_c, reset);
1451 show_graph(options->file, '-', del, del_c, reset);
1452 fprintf(options->file, "\n");
1453 }
1454 for (i = count; i < data->nr; i++) {
1455 uintmax_t added = data->files[i]->added;
1456 uintmax_t deleted = data->files[i]->deleted;
1457 if (!data->files[i]->is_renamed &&
1458 (added + deleted == 0)) {
1459 total_files--;
1460 continue;
1461 }
1462 adds += added;
1463 dels += deleted;
1464 if (!extra_shown)
1465 fprintf(options->file, "%s ...\n", line_prefix);
1466 extra_shown = 1;
1467 }
1468 fprintf(options->file, "%s", line_prefix);
1469 fprintf(options->file,
1470 " %d files changed, %d insertions(+), %d deletions(-)\n",
1471 total_files, adds, dels);
1472 }
1473
1474 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1475 {
1476 int i, adds = 0, dels = 0, total_files = data->nr;
1477
1478 if (data->nr == 0)
1479 return;
1480
1481 for (i = 0; i < data->nr; i++) {
1482 if (!data->files[i]->is_binary &&
1483 !data->files[i]->is_unmerged) {
1484 int added = data->files[i]->added;
1485 int deleted= data->files[i]->deleted;
1486 if (!data->files[i]->is_renamed &&
1487 (added + deleted == 0)) {
1488 total_files--;
1489 } else {
1490 adds += added;
1491 dels += deleted;
1492 }
1493 }
1494 }
1495 if (options->output_prefix) {
1496 struct strbuf *msg = NULL;
1497 msg = options->output_prefix(options,
1498 options->output_prefix_data);
1499 fprintf(options->file, "%s", msg->buf);
1500 }
1501 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1502 total_files, adds, dels);
1503 }
1504
1505 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1506 {
1507 int i;
1508
1509 if (data->nr == 0)
1510 return;
1511
1512 for (i = 0; i < data->nr; i++) {
1513 struct diffstat_file *file = data->files[i];
1514
1515 if (options->output_prefix) {
1516 struct strbuf *msg = NULL;
1517 msg = options->output_prefix(options,
1518 options->output_prefix_data);
1519 fprintf(options->file, "%s", msg->buf);
1520 }
1521
1522 if (file->is_binary)
1523 fprintf(options->file, "-\t-\t");
1524 else
1525 fprintf(options->file,
1526 "%"PRIuMAX"\t%"PRIuMAX"\t",
1527 file->added, file->deleted);
1528 if (options->line_termination) {
1529 fill_print_name(file);
1530 if (!file->is_renamed)
1531 write_name_quoted(file->name, options->file,
1532 options->line_termination);
1533 else {
1534 fputs(file->print_name, options->file);
1535 putc(options->line_termination, options->file);
1536 }
1537 } else {
1538 if (file->is_renamed) {
1539 putc('\0', options->file);
1540 write_name_quoted(file->from_name, options->file, '\0');
1541 }
1542 write_name_quoted(file->name, options->file, '\0');
1543 }
1544 }
1545 }
1546
1547 struct dirstat_file {
1548 const char *name;
1549 unsigned long changed;
1550 };
1551
1552 struct dirstat_dir {
1553 struct dirstat_file *files;
1554 int alloc, nr, permille, cumulative;
1555 };
1556
1557 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1558 unsigned long changed, const char *base, int baselen)
1559 {
1560 unsigned long this_dir = 0;
1561 unsigned int sources = 0;
1562 const char *line_prefix = "";
1563 struct strbuf *msg = NULL;
1564
1565 if (opt->output_prefix) {
1566 msg = opt->output_prefix(opt, opt->output_prefix_data);
1567 line_prefix = msg->buf;
1568 }
1569
1570 while (dir->nr) {
1571 struct dirstat_file *f = dir->files;
1572 int namelen = strlen(f->name);
1573 unsigned long this;
1574 char *slash;
1575
1576 if (namelen < baselen)
1577 break;
1578 if (memcmp(f->name, base, baselen))
1579 break;
1580 slash = strchr(f->name + baselen, '/');
1581 if (slash) {
1582 int newbaselen = slash + 1 - f->name;
1583 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1584 sources++;
1585 } else {
1586 this = f->changed;
1587 dir->files++;
1588 dir->nr--;
1589 sources += 2;
1590 }
1591 this_dir += this;
1592 }
1593
1594 /*
1595 * We don't report dirstat's for
1596 * - the top level
1597 * - or cases where everything came from a single directory
1598 * under this directory (sources == 1).
1599 */
1600 if (baselen && sources != 1) {
1601 if (this_dir) {
1602 int permille = this_dir * 1000 / changed;
1603 if (permille >= dir->permille) {
1604 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1605 permille / 10, permille % 10, baselen, base);
1606 if (!dir->cumulative)
1607 return 0;
1608 }
1609 }
1610 }
1611 return this_dir;
1612 }
1613
1614 static int dirstat_compare(const void *_a, const void *_b)
1615 {
1616 const struct dirstat_file *a = _a;
1617 const struct dirstat_file *b = _b;
1618 return strcmp(a->name, b->name);
1619 }
1620
1621 static void show_dirstat(struct diff_options *options)
1622 {
1623 int i;
1624 unsigned long changed;
1625 struct dirstat_dir dir;
1626 struct diff_queue_struct *q = &diff_queued_diff;
1627
1628 dir.files = NULL;
1629 dir.alloc = 0;
1630 dir.nr = 0;
1631 dir.permille = options->dirstat_permille;
1632 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1633
1634 changed = 0;
1635 for (i = 0; i < q->nr; i++) {
1636 struct diff_filepair *p = q->queue[i];
1637 const char *name;
1638 unsigned long copied, added, damage;
1639 int content_changed;
1640
1641 name = p->two->path ? p->two->path : p->one->path;
1642
1643 if (p->one->sha1_valid && p->two->sha1_valid)
1644 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1645 else
1646 content_changed = 1;
1647
1648 if (!content_changed) {
1649 /*
1650 * The SHA1 has not changed, so pre-/post-content is
1651 * identical. We can therefore skip looking at the
1652 * file contents altogether.
1653 */
1654 damage = 0;
1655 goto found_damage;
1656 }
1657
1658 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1659 /*
1660 * In --dirstat-by-file mode, we don't really need to
1661 * look at the actual file contents at all.
1662 * The fact that the SHA1 changed is enough for us to
1663 * add this file to the list of results
1664 * (with each file contributing equal damage).
1665 */
1666 damage = 1;
1667 goto found_damage;
1668 }
1669
1670 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1671 diff_populate_filespec(p->one, 0);
1672 diff_populate_filespec(p->two, 0);
1673 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1674 &copied, &added);
1675 diff_free_filespec_data(p->one);
1676 diff_free_filespec_data(p->two);
1677 } else if (DIFF_FILE_VALID(p->one)) {
1678 diff_populate_filespec(p->one, 1);
1679 copied = added = 0;
1680 diff_free_filespec_data(p->one);
1681 } else if (DIFF_FILE_VALID(p->two)) {
1682 diff_populate_filespec(p->two, 1);
1683 copied = 0;
1684 added = p->two->size;
1685 diff_free_filespec_data(p->two);
1686 } else
1687 continue;
1688
1689 /*
1690 * Original minus copied is the removed material,
1691 * added is the new material. They are both damages
1692 * made to the preimage.
1693 * If the resulting damage is zero, we know that
1694 * diffcore_count_changes() considers the two entries to
1695 * be identical, but since content_changed is true, we
1696 * know that there must have been _some_ kind of change,
1697 * so we force all entries to have damage > 0.
1698 */
1699 damage = (p->one->size - copied) + added;
1700 if (!damage)
1701 damage = 1;
1702
1703 found_damage:
1704 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1705 dir.files[dir.nr].name = name;
1706 dir.files[dir.nr].changed = damage;
1707 changed += damage;
1708 dir.nr++;
1709 }
1710
1711 /* This can happen even with many files, if everything was renames */
1712 if (!changed)
1713 return;
1714
1715 /* Show all directories with more than x% of the changes */
1716 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1717 gather_dirstat(options, &dir, changed, "", 0);
1718 }
1719
1720 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1721 {
1722 int i;
1723 unsigned long changed;
1724 struct dirstat_dir dir;
1725
1726 if (data->nr == 0)
1727 return;
1728
1729 dir.files = NULL;
1730 dir.alloc = 0;
1731 dir.nr = 0;
1732 dir.permille = options->dirstat_permille;
1733 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1734
1735 changed = 0;
1736 for (i = 0; i < data->nr; i++) {
1737 struct diffstat_file *file = data->files[i];
1738 unsigned long damage = file->added + file->deleted;
1739 if (file->is_binary)
1740 /*
1741 * binary files counts bytes, not lines. Must find some
1742 * way to normalize binary bytes vs. textual lines.
1743 * The following heuristic assumes that there are 64
1744 * bytes per "line".
1745 * This is stupid and ugly, but very cheap...
1746 */
1747 damage = (damage + 63) / 64;
1748 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1749 dir.files[dir.nr].name = file->name;
1750 dir.files[dir.nr].changed = damage;
1751 changed += damage;
1752 dir.nr++;
1753 }
1754
1755 /* This can happen even with many files, if everything was renames */
1756 if (!changed)
1757 return;
1758
1759 /* Show all directories with more than x% of the changes */
1760 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1761 gather_dirstat(options, &dir, changed, "", 0);
1762 }
1763
1764 static void free_diffstat_info(struct diffstat_t *diffstat)
1765 {
1766 int i;
1767 for (i = 0; i < diffstat->nr; i++) {
1768 struct diffstat_file *f = diffstat->files[i];
1769 if (f->name != f->print_name)
1770 free(f->print_name);
1771 free(f->name);
1772 free(f->from_name);
1773 free(f);
1774 }
1775 free(diffstat->files);
1776 }
1777
1778 struct checkdiff_t {
1779 const char *filename;
1780 int lineno;
1781 int conflict_marker_size;
1782 struct diff_options *o;
1783 unsigned ws_rule;
1784 unsigned status;
1785 };
1786
1787 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1788 {
1789 char firstchar;
1790 int cnt;
1791
1792 if (len < marker_size + 1)
1793 return 0;
1794 firstchar = line[0];
1795 switch (firstchar) {
1796 case '=': case '>': case '<': case '|':
1797 break;
1798 default:
1799 return 0;
1800 }
1801 for (cnt = 1; cnt < marker_size; cnt++)
1802 if (line[cnt] != firstchar)
1803 return 0;
1804 /* line[1] thru line[marker_size-1] are same as firstchar */
1805 if (len < marker_size + 1 || !isspace(line[marker_size]))
1806 return 0;
1807 return 1;
1808 }
1809
1810 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1811 {
1812 struct checkdiff_t *data = priv;
1813 int marker_size = data->conflict_marker_size;
1814 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
1815 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
1816 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
1817 char *err;
1818 char *line_prefix = "";
1819 struct strbuf *msgbuf;
1820
1821 assert(data->o);
1822 if (data->o->output_prefix) {
1823 msgbuf = data->o->output_prefix(data->o,
1824 data->o->output_prefix_data);
1825 line_prefix = msgbuf->buf;
1826 }
1827
1828 if (line[0] == '+') {
1829 unsigned bad;
1830 data->lineno++;
1831 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1832 data->status |= 1;
1833 fprintf(data->o->file,
1834 "%s%s:%d: leftover conflict marker\n",
1835 line_prefix, data->filename, data->lineno);
1836 }
1837 bad = ws_check(line + 1, len - 1, data->ws_rule);
1838 if (!bad)
1839 return;
1840 data->status |= bad;
1841 err = whitespace_error_string(bad);
1842 fprintf(data->o->file, "%s%s:%d: %s.\n",
1843 line_prefix, data->filename, data->lineno, err);
1844 free(err);
1845 emit_line(data->o, set, reset, line, 1);
1846 ws_check_emit(line + 1, len - 1, data->ws_rule,
1847 data->o->file, set, reset, ws);
1848 } else if (line[0] == ' ') {
1849 data->lineno++;
1850 } else if (line[0] == '@') {
1851 char *plus = strchr(line, '+');
1852 if (plus)
1853 data->lineno = strtol(plus, NULL, 10) - 1;
1854 else
1855 die("invalid diff");
1856 }
1857 }
1858
1859 static unsigned char *deflate_it(char *data,
1860 unsigned long size,
1861 unsigned long *result_size)
1862 {
1863 int bound;
1864 unsigned char *deflated;
1865 git_zstream stream;
1866
1867 memset(&stream, 0, sizeof(stream));
1868 git_deflate_init(&stream, zlib_compression_level);
1869 bound = git_deflate_bound(&stream, size);
1870 deflated = xmalloc(bound);
1871 stream.next_out = deflated;
1872 stream.avail_out = bound;
1873
1874 stream.next_in = (unsigned char *)data;
1875 stream.avail_in = size;
1876 while (git_deflate(&stream, Z_FINISH) == Z_OK)
1877 ; /* nothing */
1878 git_deflate_end(&stream);
1879 *result_size = stream.total_out;
1880 return deflated;
1881 }
1882
1883 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1884 {
1885 void *cp;
1886 void *delta;
1887 void *deflated;
1888 void *data;
1889 unsigned long orig_size;
1890 unsigned long delta_size;
1891 unsigned long deflate_size;
1892 unsigned long data_size;
1893
1894 /* We could do deflated delta, or we could do just deflated two,
1895 * whichever is smaller.
1896 */
1897 delta = NULL;
1898 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1899 if (one->size && two->size) {
1900 delta = diff_delta(one->ptr, one->size,
1901 two->ptr, two->size,
1902 &delta_size, deflate_size);
1903 if (delta) {
1904 void *to_free = delta;
1905 orig_size = delta_size;
1906 delta = deflate_it(delta, delta_size, &delta_size);
1907 free(to_free);
1908 }
1909 }
1910
1911 if (delta && delta_size < deflate_size) {
1912 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1913 free(deflated);
1914 data = delta;
1915 data_size = delta_size;
1916 }
1917 else {
1918 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1919 free(delta);
1920 data = deflated;
1921 data_size = deflate_size;
1922 }
1923
1924 /* emit data encoded in base85 */
1925 cp = data;
1926 while (data_size) {
1927 int bytes = (52 < data_size) ? 52 : data_size;
1928 char line[70];
1929 data_size -= bytes;
1930 if (bytes <= 26)
1931 line[0] = bytes + 'A' - 1;
1932 else
1933 line[0] = bytes - 26 + 'a' - 1;
1934 encode_85(line + 1, cp, bytes);
1935 cp = (char *) cp + bytes;
1936 fprintf(file, "%s", prefix);
1937 fputs(line, file);
1938 fputc('\n', file);
1939 }
1940 fprintf(file, "%s\n", prefix);
1941 free(data);
1942 }
1943
1944 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1945 {
1946 fprintf(file, "%sGIT binary patch\n", prefix);
1947 emit_binary_diff_body(file, one, two, prefix);
1948 emit_binary_diff_body(file, two, one, prefix);
1949 }
1950
1951 static void diff_filespec_load_driver(struct diff_filespec *one)
1952 {
1953 /* Use already-loaded driver */
1954 if (one->driver)
1955 return;
1956
1957 if (S_ISREG(one->mode))
1958 one->driver = userdiff_find_by_path(one->path);
1959
1960 /* Fallback to default settings */
1961 if (!one->driver)
1962 one->driver = userdiff_find_by_name("default");
1963 }
1964
1965 int diff_filespec_is_binary(struct diff_filespec *one)
1966 {
1967 if (one->is_binary == -1) {
1968 diff_filespec_load_driver(one);
1969 if (one->driver->binary != -1)
1970 one->is_binary = one->driver->binary;
1971 else {
1972 if (!one->data && DIFF_FILE_VALID(one))
1973 diff_populate_filespec(one, 0);
1974 if (one->data)
1975 one->is_binary = buffer_is_binary(one->data,
1976 one->size);
1977 if (one->is_binary == -1)
1978 one->is_binary = 0;
1979 }
1980 }
1981 return one->is_binary;
1982 }
1983
1984 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1985 {
1986 diff_filespec_load_driver(one);
1987 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1988 }
1989
1990 static const char *userdiff_word_regex(struct diff_filespec *one)
1991 {
1992 diff_filespec_load_driver(one);
1993 return one->driver->word_regex;
1994 }
1995
1996 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1997 {
1998 if (!options->a_prefix)
1999 options->a_prefix = a;
2000 if (!options->b_prefix)
2001 options->b_prefix = b;
2002 }
2003
2004 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2005 {
2006 if (!DIFF_FILE_VALID(one))
2007 return NULL;
2008
2009 diff_filespec_load_driver(one);
2010 return userdiff_get_textconv(one->driver);
2011 }
2012
2013 static void builtin_diff(const char *name_a,
2014 const char *name_b,
2015 struct diff_filespec *one,
2016 struct diff_filespec *two,
2017 const char *xfrm_msg,
2018 int must_show_header,
2019 struct diff_options *o,
2020 int complete_rewrite)
2021 {
2022 mmfile_t mf1, mf2;
2023 const char *lbl[2];
2024 char *a_one, *b_two;
2025 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2026 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2027 const char *a_prefix, *b_prefix;
2028 struct userdiff_driver *textconv_one = NULL;
2029 struct userdiff_driver *textconv_two = NULL;
2030 struct strbuf header = STRBUF_INIT;
2031 struct strbuf *msgbuf;
2032 char *line_prefix = "";
2033
2034 if (o->output_prefix) {
2035 msgbuf = o->output_prefix(o, o->output_prefix_data);
2036 line_prefix = msgbuf->buf;
2037 }
2038
2039 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2040 (!one->mode || S_ISGITLINK(one->mode)) &&
2041 (!two->mode || S_ISGITLINK(two->mode))) {
2042 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2043 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2044 show_submodule_summary(o->file, one ? one->path : two->path,
2045 one->sha1, two->sha1, two->dirty_submodule,
2046 del, add, reset);
2047 return;
2048 }
2049
2050 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2051 textconv_one = get_textconv(one);
2052 textconv_two = get_textconv(two);
2053 }
2054
2055 diff_set_mnemonic_prefix(o, "a/", "b/");
2056 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2057 a_prefix = o->b_prefix;
2058 b_prefix = o->a_prefix;
2059 } else {
2060 a_prefix = o->a_prefix;
2061 b_prefix = o->b_prefix;
2062 }
2063
2064 /* Never use a non-valid filename anywhere if at all possible */
2065 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2066 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2067
2068 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2069 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2070 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2071 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2072 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2073 if (lbl[0][0] == '/') {
2074 /* /dev/null */
2075 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2076 if (xfrm_msg)
2077 strbuf_addstr(&header, xfrm_msg);
2078 must_show_header = 1;
2079 }
2080 else if (lbl[1][0] == '/') {
2081 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2082 if (xfrm_msg)
2083 strbuf_addstr(&header, xfrm_msg);
2084 must_show_header = 1;
2085 }
2086 else {
2087 if (one->mode != two->mode) {
2088 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2089 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2090 must_show_header = 1;
2091 }
2092 if (xfrm_msg)
2093 strbuf_addstr(&header, xfrm_msg);
2094
2095 /*
2096 * we do not run diff between different kind
2097 * of objects.
2098 */
2099 if ((one->mode ^ two->mode) & S_IFMT)
2100 goto free_ab_and_return;
2101 if (complete_rewrite &&
2102 (textconv_one || !diff_filespec_is_binary(one)) &&
2103 (textconv_two || !diff_filespec_is_binary(two))) {
2104 fprintf(o->file, "%s", header.buf);
2105 strbuf_reset(&header);
2106 emit_rewrite_diff(name_a, name_b, one, two,
2107 textconv_one, textconv_two, o);
2108 o->found_changes = 1;
2109 goto free_ab_and_return;
2110 }
2111 }
2112
2113 if (o->irreversible_delete && lbl[1][0] == '/') {
2114 fprintf(o->file, "%s", header.buf);
2115 strbuf_reset(&header);
2116 goto free_ab_and_return;
2117 } else if (!DIFF_OPT_TST(o, TEXT) &&
2118 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2119 (!textconv_two && diff_filespec_is_binary(two)) )) {
2120 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2121 die("unable to read files to diff");
2122 /* Quite common confusing case */
2123 if (mf1.size == mf2.size &&
2124 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2125 if (must_show_header)
2126 fprintf(o->file, "%s", header.buf);
2127 goto free_ab_and_return;
2128 }
2129 fprintf(o->file, "%s", header.buf);
2130 strbuf_reset(&header);
2131 if (DIFF_OPT_TST(o, BINARY))
2132 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2133 else
2134 fprintf(o->file, "%sBinary files %s and %s differ\n",
2135 line_prefix, lbl[0], lbl[1]);
2136 o->found_changes = 1;
2137 } else {
2138 /* Crazy xdl interfaces.. */
2139 const char *diffopts = getenv("GIT_DIFF_OPTS");
2140 xpparam_t xpp;
2141 xdemitconf_t xecfg;
2142 struct emit_callback ecbdata;
2143 const struct userdiff_funcname *pe;
2144
2145 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
2146 fprintf(o->file, "%s", header.buf);
2147 strbuf_reset(&header);
2148 }
2149
2150 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2151 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2152
2153 pe = diff_funcname_pattern(one);
2154 if (!pe)
2155 pe = diff_funcname_pattern(two);
2156
2157 memset(&xpp, 0, sizeof(xpp));
2158 memset(&xecfg, 0, sizeof(xecfg));
2159 memset(&ecbdata, 0, sizeof(ecbdata));
2160 ecbdata.label_path = lbl;
2161 ecbdata.color_diff = want_color(o->use_color);
2162 ecbdata.found_changesp = &o->found_changes;
2163 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2164 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2165 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2166 ecbdata.opt = o;
2167 ecbdata.header = header.len ? &header : NULL;
2168 xpp.flags = o->xdl_opts;
2169 xecfg.ctxlen = o->context;
2170 xecfg.interhunkctxlen = o->interhunkcontext;
2171 xecfg.flags = XDL_EMIT_FUNCNAMES;
2172 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2173 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2174 if (pe)
2175 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2176 if (!diffopts)
2177 ;
2178 else if (!prefixcmp(diffopts, "--unified="))
2179 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2180 else if (!prefixcmp(diffopts, "-u"))
2181 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2182 if (o->word_diff) {
2183 int i;
2184
2185 ecbdata.diff_words =
2186 xcalloc(1, sizeof(struct diff_words_data));
2187 ecbdata.diff_words->type = o->word_diff;
2188 ecbdata.diff_words->opt = o;
2189 if (!o->word_regex)
2190 o->word_regex = userdiff_word_regex(one);
2191 if (!o->word_regex)
2192 o->word_regex = userdiff_word_regex(two);
2193 if (!o->word_regex)
2194 o->word_regex = diff_word_regex_cfg;
2195 if (o->word_regex) {
2196 ecbdata.diff_words->word_regex = (regex_t *)
2197 xmalloc(sizeof(regex_t));
2198 if (regcomp(ecbdata.diff_words->word_regex,
2199 o->word_regex,
2200 REG_EXTENDED | REG_NEWLINE))
2201 die ("Invalid regular expression: %s",
2202 o->word_regex);
2203 }
2204 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2205 if (o->word_diff == diff_words_styles[i].type) {
2206 ecbdata.diff_words->style =
2207 &diff_words_styles[i];
2208 break;
2209 }
2210 }
2211 if (want_color(o->use_color)) {
2212 struct diff_words_style *st = ecbdata.diff_words->style;
2213 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2214 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2215 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2216 }
2217 }
2218 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2219 &xpp, &xecfg);
2220 if (o->word_diff)
2221 free_diff_words_data(&ecbdata);
2222 if (textconv_one)
2223 free(mf1.ptr);
2224 if (textconv_two)
2225 free(mf2.ptr);
2226 xdiff_clear_find_func(&xecfg);
2227 }
2228
2229 free_ab_and_return:
2230 strbuf_release(&header);
2231 diff_free_filespec_data(one);
2232 diff_free_filespec_data(two);
2233 free(a_one);
2234 free(b_two);
2235 return;
2236 }
2237
2238 static void builtin_diffstat(const char *name_a, const char *name_b,
2239 struct diff_filespec *one,
2240 struct diff_filespec *two,
2241 struct diffstat_t *diffstat,
2242 struct diff_options *o,
2243 int complete_rewrite)
2244 {
2245 mmfile_t mf1, mf2;
2246 struct diffstat_file *data;
2247
2248 data = diffstat_add(diffstat, name_a, name_b);
2249
2250 if (!one || !two) {
2251 data->is_unmerged = 1;
2252 return;
2253 }
2254
2255 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2256 data->is_binary = 1;
2257 data->added = diff_filespec_size(two);
2258 data->deleted = diff_filespec_size(one);
2259 }
2260
2261 else if (complete_rewrite) {
2262 diff_populate_filespec(one, 0);
2263 diff_populate_filespec(two, 0);
2264 data->deleted = count_lines(one->data, one->size);
2265 data->added = count_lines(two->data, two->size);
2266 }
2267
2268 else {
2269 /* Crazy xdl interfaces.. */
2270 xpparam_t xpp;
2271 xdemitconf_t xecfg;
2272
2273 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2274 die("unable to read files to diff");
2275
2276 memset(&xpp, 0, sizeof(xpp));
2277 memset(&xecfg, 0, sizeof(xecfg));
2278 xpp.flags = o->xdl_opts;
2279 xecfg.ctxlen = o->context;
2280 xecfg.interhunkctxlen = o->interhunkcontext;
2281 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2282 &xpp, &xecfg);
2283 }
2284
2285 diff_free_filespec_data(one);
2286 diff_free_filespec_data(two);
2287 }
2288
2289 static void builtin_checkdiff(const char *name_a, const char *name_b,
2290 const char *attr_path,
2291 struct diff_filespec *one,
2292 struct diff_filespec *two,
2293 struct diff_options *o)
2294 {
2295 mmfile_t mf1, mf2;
2296 struct checkdiff_t data;
2297
2298 if (!two)
2299 return;
2300
2301 memset(&data, 0, sizeof(data));
2302 data.filename = name_b ? name_b : name_a;
2303 data.lineno = 0;
2304 data.o = o;
2305 data.ws_rule = whitespace_rule(attr_path);
2306 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2307
2308 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2309 die("unable to read files to diff");
2310
2311 /*
2312 * All the other codepaths check both sides, but not checking
2313 * the "old" side here is deliberate. We are checking the newly
2314 * introduced changes, and as long as the "new" side is text, we
2315 * can and should check what it introduces.
2316 */
2317 if (diff_filespec_is_binary(two))
2318 goto free_and_return;
2319 else {
2320 /* Crazy xdl interfaces.. */
2321 xpparam_t xpp;
2322 xdemitconf_t xecfg;
2323
2324 memset(&xpp, 0, sizeof(xpp));
2325 memset(&xecfg, 0, sizeof(xecfg));
2326 xecfg.ctxlen = 1; /* at least one context line */
2327 xpp.flags = 0;
2328 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2329 &xpp, &xecfg);
2330
2331 if (data.ws_rule & WS_BLANK_AT_EOF) {
2332 struct emit_callback ecbdata;
2333 int blank_at_eof;
2334
2335 ecbdata.ws_rule = data.ws_rule;
2336 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2337 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2338
2339 if (blank_at_eof) {
2340 static char *err;
2341 if (!err)
2342 err = whitespace_error_string(WS_BLANK_AT_EOF);
2343 fprintf(o->file, "%s:%d: %s.\n",
2344 data.filename, blank_at_eof, err);
2345 data.status = 1; /* report errors */
2346 }
2347 }
2348 }
2349 free_and_return:
2350 diff_free_filespec_data(one);
2351 diff_free_filespec_data(two);
2352 if (data.status)
2353 DIFF_OPT_SET(o, CHECK_FAILED);
2354 }
2355
2356 struct diff_filespec *alloc_filespec(const char *path)
2357 {
2358 int namelen = strlen(path);
2359 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2360
2361 memset(spec, 0, sizeof(*spec));
2362 spec->path = (char *)(spec + 1);
2363 memcpy(spec->path, path, namelen+1);
2364 spec->count = 1;
2365 spec->is_binary = -1;
2366 return spec;
2367 }
2368
2369 void free_filespec(struct diff_filespec *spec)
2370 {
2371 if (!--spec->count) {
2372 diff_free_filespec_data(spec);
2373 free(spec);
2374 }
2375 }
2376
2377 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2378 unsigned short mode)
2379 {
2380 if (mode) {
2381 spec->mode = canon_mode(mode);
2382 hashcpy(spec->sha1, sha1);
2383 spec->sha1_valid = !is_null_sha1(sha1);
2384 }
2385 }
2386
2387 /*
2388 * Given a name and sha1 pair, if the index tells us the file in
2389 * the work tree has that object contents, return true, so that
2390 * prepare_temp_file() does not have to inflate and extract.
2391 */
2392 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2393 {
2394 struct cache_entry *ce;
2395 struct stat st;
2396 int pos, len;
2397
2398 /*
2399 * We do not read the cache ourselves here, because the
2400 * benchmark with my previous version that always reads cache
2401 * shows that it makes things worse for diff-tree comparing
2402 * two linux-2.6 kernel trees in an already checked out work
2403 * tree. This is because most diff-tree comparisons deal with
2404 * only a small number of files, while reading the cache is
2405 * expensive for a large project, and its cost outweighs the
2406 * savings we get by not inflating the object to a temporary
2407 * file. Practically, this code only helps when we are used
2408 * by diff-cache --cached, which does read the cache before
2409 * calling us.
2410 */
2411 if (!active_cache)
2412 return 0;
2413
2414 /* We want to avoid the working directory if our caller
2415 * doesn't need the data in a normal file, this system
2416 * is rather slow with its stat/open/mmap/close syscalls,
2417 * and the object is contained in a pack file. The pack
2418 * is probably already open and will be faster to obtain
2419 * the data through than the working directory. Loose
2420 * objects however would tend to be slower as they need
2421 * to be individually opened and inflated.
2422 */
2423 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2424 return 0;
2425
2426 len = strlen(name);
2427 pos = cache_name_pos(name, len);
2428 if (pos < 0)
2429 return 0;
2430 ce = active_cache[pos];
2431
2432 /*
2433 * This is not the sha1 we are looking for, or
2434 * unreusable because it is not a regular file.
2435 */
2436 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2437 return 0;
2438
2439 /*
2440 * If ce is marked as "assume unchanged", there is no
2441 * guarantee that work tree matches what we are looking for.
2442 */
2443 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2444 return 0;
2445
2446 /*
2447 * If ce matches the file in the work tree, we can reuse it.
2448 */
2449 if (ce_uptodate(ce) ||
2450 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2451 return 1;
2452
2453 return 0;
2454 }
2455
2456 static int populate_from_stdin(struct diff_filespec *s)
2457 {
2458 struct strbuf buf = STRBUF_INIT;
2459 size_t size = 0;
2460
2461 if (strbuf_read(&buf, 0, 0) < 0)
2462 return error("error while reading from stdin %s",
2463 strerror(errno));
2464
2465 s->should_munmap = 0;
2466 s->data = strbuf_detach(&buf, &size);
2467 s->size = size;
2468 s->should_free = 1;
2469 return 0;
2470 }
2471
2472 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2473 {
2474 int len;
2475 char *data = xmalloc(100), *dirty = "";
2476
2477 /* Are we looking at the work tree? */
2478 if (s->dirty_submodule)
2479 dirty = "-dirty";
2480
2481 len = snprintf(data, 100,
2482 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2483 s->data = data;
2484 s->size = len;
2485 s->should_free = 1;
2486 if (size_only) {
2487 s->data = NULL;
2488 free(data);
2489 }
2490 return 0;
2491 }
2492
2493 /*
2494 * While doing rename detection and pickaxe operation, we may need to
2495 * grab the data for the blob (or file) for our own in-core comparison.
2496 * diff_filespec has data and size fields for this purpose.
2497 */
2498 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2499 {
2500 int err = 0;
2501 if (!DIFF_FILE_VALID(s))
2502 die("internal error: asking to populate invalid file.");
2503 if (S_ISDIR(s->mode))
2504 return -1;
2505
2506 if (s->data)
2507 return 0;
2508
2509 if (size_only && 0 < s->size)
2510 return 0;
2511
2512 if (S_ISGITLINK(s->mode))
2513 return diff_populate_gitlink(s, size_only);
2514
2515 if (!s->sha1_valid ||
2516 reuse_worktree_file(s->path, s->sha1, 0)) {
2517 struct strbuf buf = STRBUF_INIT;
2518 struct stat st;
2519 int fd;
2520
2521 if (!strcmp(s->path, "-"))
2522 return populate_from_stdin(s);
2523
2524 if (lstat(s->path, &st) < 0) {
2525 if (errno == ENOENT) {
2526 err_empty:
2527 err = -1;
2528 empty:
2529 s->data = (char *)"";
2530 s->size = 0;
2531 return err;
2532 }
2533 }
2534 s->size = xsize_t(st.st_size);
2535 if (!s->size)
2536 goto empty;
2537 if (S_ISLNK(st.st_mode)) {
2538 struct strbuf sb = STRBUF_INIT;
2539
2540 if (strbuf_readlink(&sb, s->path, s->size))
2541 goto err_empty;
2542 s->size = sb.len;
2543 s->data = strbuf_detach(&sb, NULL);
2544 s->should_free = 1;
2545 return 0;
2546 }
2547 if (size_only)
2548 return 0;
2549 fd = open(s->path, O_RDONLY);
2550 if (fd < 0)
2551 goto err_empty;
2552 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2553 close(fd);
2554 s->should_munmap = 1;
2555
2556 /*
2557 * Convert from working tree format to canonical git format
2558 */
2559 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2560 size_t size = 0;
2561 munmap(s->data, s->size);
2562 s->should_munmap = 0;
2563 s->data = strbuf_detach(&buf, &size);
2564 s->size = size;
2565 s->should_free = 1;
2566 }
2567 }
2568 else {
2569 enum object_type type;
2570 if (size_only) {
2571 type = sha1_object_info(s->sha1, &s->size);
2572 if (type < 0)
2573 die("unable to read %s", sha1_to_hex(s->sha1));
2574 } else {
2575 s->data = read_sha1_file(s->sha1, &type, &s->size);
2576 if (!s->data)
2577 die("unable to read %s", sha1_to_hex(s->sha1));
2578 s->should_free = 1;
2579 }
2580 }
2581 return 0;
2582 }
2583
2584 void diff_free_filespec_blob(struct diff_filespec *s)
2585 {
2586 if (s->should_free)
2587 free(s->data);
2588 else if (s->should_munmap)
2589 munmap(s->data, s->size);
2590
2591 if (s->should_free || s->should_munmap) {
2592 s->should_free = s->should_munmap = 0;
2593 s->data = NULL;
2594 }
2595 }
2596
2597 void diff_free_filespec_data(struct diff_filespec *s)
2598 {
2599 diff_free_filespec_blob(s);
2600 free(s->cnt_data);
2601 s->cnt_data = NULL;
2602 }
2603
2604 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2605 void *blob,
2606 unsigned long size,
2607 const unsigned char *sha1,
2608 int mode)
2609 {
2610 int fd;
2611 struct strbuf buf = STRBUF_INIT;
2612 struct strbuf template = STRBUF_INIT;
2613 char *path_dup = xstrdup(path);
2614 const char *base = basename(path_dup);
2615
2616 /* Generate "XXXXXX_basename.ext" */
2617 strbuf_addstr(&template, "XXXXXX_");
2618 strbuf_addstr(&template, base);
2619
2620 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2621 strlen(base) + 1);
2622 if (fd < 0)
2623 die_errno("unable to create temp-file");
2624 if (convert_to_working_tree(path,
2625 (const char *)blob, (size_t)size, &buf)) {
2626 blob = buf.buf;
2627 size = buf.len;
2628 }
2629 if (write_in_full(fd, blob, size) != size)
2630 die_errno("unable to write temp-file");
2631 close(fd);
2632 temp->name = temp->tmp_path;
2633 strcpy(temp->hex, sha1_to_hex(sha1));
2634 temp->hex[40] = 0;
2635 sprintf(temp->mode, "%06o", mode);
2636 strbuf_release(&buf);
2637 strbuf_release(&template);
2638 free(path_dup);
2639 }
2640
2641 static struct diff_tempfile *prepare_temp_file(const char *name,
2642 struct diff_filespec *one)
2643 {
2644 struct diff_tempfile *temp = claim_diff_tempfile();
2645
2646 if (!DIFF_FILE_VALID(one)) {
2647 not_a_valid_file:
2648 /* A '-' entry produces this for file-2, and
2649 * a '+' entry produces this for file-1.
2650 */
2651 temp->name = "/dev/null";
2652 strcpy(temp->hex, ".");
2653 strcpy(temp->mode, ".");
2654 return temp;
2655 }
2656
2657 if (!remove_tempfile_installed) {
2658 atexit(remove_tempfile);
2659 sigchain_push_common(remove_tempfile_on_signal);
2660 remove_tempfile_installed = 1;
2661 }
2662
2663 if (!one->sha1_valid ||
2664 reuse_worktree_file(name, one->sha1, 1)) {
2665 struct stat st;
2666 if (lstat(name, &st) < 0) {
2667 if (errno == ENOENT)
2668 goto not_a_valid_file;
2669 die_errno("stat(%s)", name);
2670 }
2671 if (S_ISLNK(st.st_mode)) {
2672 struct strbuf sb = STRBUF_INIT;
2673 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2674 die_errno("readlink(%s)", name);
2675 prep_temp_blob(name, temp, sb.buf, sb.len,
2676 (one->sha1_valid ?
2677 one->sha1 : null_sha1),
2678 (one->sha1_valid ?
2679 one->mode : S_IFLNK));
2680 strbuf_release(&sb);
2681 }
2682 else {
2683 /* we can borrow from the file in the work tree */
2684 temp->name = name;
2685 if (!one->sha1_valid)
2686 strcpy(temp->hex, sha1_to_hex(null_sha1));
2687 else
2688 strcpy(temp->hex, sha1_to_hex(one->sha1));
2689 /* Even though we may sometimes borrow the
2690 * contents from the work tree, we always want
2691 * one->mode. mode is trustworthy even when
2692 * !(one->sha1_valid), as long as
2693 * DIFF_FILE_VALID(one).
2694 */
2695 sprintf(temp->mode, "%06o", one->mode);
2696 }
2697 return temp;
2698 }
2699 else {
2700 if (diff_populate_filespec(one, 0))
2701 die("cannot read data blob for %s", one->path);
2702 prep_temp_blob(name, temp, one->data, one->size,
2703 one->sha1, one->mode);
2704 }
2705 return temp;
2706 }
2707
2708 /* An external diff command takes:
2709 *
2710 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2711 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2712 *
2713 */
2714 static void run_external_diff(const char *pgm,
2715 const char *name,
2716 const char *other,
2717 struct diff_filespec *one,
2718 struct diff_filespec *two,
2719 const char *xfrm_msg,
2720 int complete_rewrite)
2721 {
2722 const char *spawn_arg[10];
2723 int retval;
2724 const char **arg = &spawn_arg[0];
2725
2726 if (one && two) {
2727 struct diff_tempfile *temp_one, *temp_two;
2728 const char *othername = (other ? other : name);
2729 temp_one = prepare_temp_file(name, one);
2730 temp_two = prepare_temp_file(othername, two);
2731 *arg++ = pgm;
2732 *arg++ = name;
2733 *arg++ = temp_one->name;
2734 *arg++ = temp_one->hex;
2735 *arg++ = temp_one->mode;
2736 *arg++ = temp_two->name;
2737 *arg++ = temp_two->hex;
2738 *arg++ = temp_two->mode;
2739 if (other) {
2740 *arg++ = other;
2741 *arg++ = xfrm_msg;
2742 }
2743 } else {
2744 *arg++ = pgm;
2745 *arg++ = name;
2746 }
2747 *arg = NULL;
2748 fflush(NULL);
2749 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2750 remove_tempfile();
2751 if (retval) {
2752 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2753 exit(1);
2754 }
2755 }
2756
2757 static int similarity_index(struct diff_filepair *p)
2758 {
2759 return p->score * 100 / MAX_SCORE;
2760 }
2761
2762 static void fill_metainfo(struct strbuf *msg,
2763 const char *name,
2764 const char *other,
2765 struct diff_filespec *one,
2766 struct diff_filespec *two,
2767 struct diff_options *o,
2768 struct diff_filepair *p,
2769 int *must_show_header,
2770 int use_color)
2771 {
2772 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2773 const char *reset = diff_get_color(use_color, DIFF_RESET);
2774 struct strbuf *msgbuf;
2775 char *line_prefix = "";
2776
2777 *must_show_header = 1;
2778 if (o->output_prefix) {
2779 msgbuf = o->output_prefix(o, o->output_prefix_data);
2780 line_prefix = msgbuf->buf;
2781 }
2782 strbuf_init(msg, PATH_MAX * 2 + 300);
2783 switch (p->status) {
2784 case DIFF_STATUS_COPIED:
2785 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2786 line_prefix, set, similarity_index(p));
2787 strbuf_addf(msg, "%s\n%s%scopy from ",
2788 reset, line_prefix, set);
2789 quote_c_style(name, msg, NULL, 0);
2790 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2791 quote_c_style(other, msg, NULL, 0);
2792 strbuf_addf(msg, "%s\n", reset);
2793 break;
2794 case DIFF_STATUS_RENAMED:
2795 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2796 line_prefix, set, similarity_index(p));
2797 strbuf_addf(msg, "%s\n%s%srename from ",
2798 reset, line_prefix, set);
2799 quote_c_style(name, msg, NULL, 0);
2800 strbuf_addf(msg, "%s\n%s%srename to ",
2801 reset, line_prefix, set);
2802 quote_c_style(other, msg, NULL, 0);
2803 strbuf_addf(msg, "%s\n", reset);
2804 break;
2805 case DIFF_STATUS_MODIFIED:
2806 if (p->score) {
2807 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2808 line_prefix,
2809 set, similarity_index(p), reset);
2810 break;
2811 }
2812 /* fallthru */
2813 default:
2814 *must_show_header = 0;
2815 }
2816 if (one && two && hashcmp(one->sha1, two->sha1)) {
2817 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2818
2819 if (DIFF_OPT_TST(o, BINARY)) {
2820 mmfile_t mf;
2821 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2822 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2823 abbrev = 40;
2824 }
2825 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2826 find_unique_abbrev(one->sha1, abbrev));
2827 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2828 if (one->mode == two->mode)
2829 strbuf_addf(msg, " %06o", one->mode);
2830 strbuf_addf(msg, "%s\n", reset);
2831 }
2832 }
2833
2834 static void run_diff_cmd(const char *pgm,
2835 const char *name,
2836 const char *other,
2837 const char *attr_path,
2838 struct diff_filespec *one,
2839 struct diff_filespec *two,
2840 struct strbuf *msg,
2841 struct diff_options *o,
2842 struct diff_filepair *p)
2843 {
2844 const char *xfrm_msg = NULL;
2845 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2846 int must_show_header = 0;
2847
2848 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2849 pgm = NULL;
2850 else {
2851 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2852 if (drv && drv->external)
2853 pgm = drv->external;
2854 }
2855
2856 if (msg) {
2857 /*
2858 * don't use colors when the header is intended for an
2859 * external diff driver
2860 */
2861 fill_metainfo(msg, name, other, one, two, o, p,
2862 &must_show_header,
2863 want_color(o->use_color) && !pgm);
2864 xfrm_msg = msg->len ? msg->buf : NULL;
2865 }
2866
2867 if (pgm) {
2868 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2869 complete_rewrite);
2870 return;
2871 }
2872 if (one && two)
2873 builtin_diff(name, other ? other : name,
2874 one, two, xfrm_msg, must_show_header,
2875 o, complete_rewrite);
2876 else
2877 fprintf(o->file, "* Unmerged path %s\n", name);
2878 }
2879
2880 static void diff_fill_sha1_info(struct diff_filespec *one)
2881 {
2882 if (DIFF_FILE_VALID(one)) {
2883 if (!one->sha1_valid) {
2884 struct stat st;
2885 if (!strcmp(one->path, "-")) {
2886 hashcpy(one->sha1, null_sha1);
2887 return;
2888 }
2889 if (lstat(one->path, &st) < 0)
2890 die_errno("stat '%s'", one->path);
2891 if (index_path(one->sha1, one->path, &st, 0))
2892 die("cannot hash %s", one->path);
2893 }
2894 }
2895 else
2896 hashclr(one->sha1);
2897 }
2898
2899 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2900 {
2901 /* Strip the prefix but do not molest /dev/null and absolute paths */
2902 if (*namep && **namep != '/') {
2903 *namep += prefix_length;
2904 if (**namep == '/')
2905 ++*namep;
2906 }
2907 if (*otherp && **otherp != '/') {
2908 *otherp += prefix_length;
2909 if (**otherp == '/')
2910 ++*otherp;
2911 }
2912 }
2913
2914 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2915 {
2916 const char *pgm = external_diff();
2917 struct strbuf msg;
2918 struct diff_filespec *one = p->one;
2919 struct diff_filespec *two = p->two;
2920 const char *name;
2921 const char *other;
2922 const char *attr_path;
2923
2924 name = p->one->path;
2925 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2926 attr_path = name;
2927 if (o->prefix_length)
2928 strip_prefix(o->prefix_length, &name, &other);
2929
2930 if (DIFF_PAIR_UNMERGED(p)) {
2931 run_diff_cmd(pgm, name, NULL, attr_path,
2932 NULL, NULL, NULL, o, p);
2933 return;
2934 }
2935
2936 diff_fill_sha1_info(one);
2937 diff_fill_sha1_info(two);
2938
2939 if (!pgm &&
2940 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2941 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2942 /*
2943 * a filepair that changes between file and symlink
2944 * needs to be split into deletion and creation.
2945 */
2946 struct diff_filespec *null = alloc_filespec(two->path);
2947 run_diff_cmd(NULL, name, other, attr_path,
2948 one, null, &msg, o, p);
2949 free(null);
2950 strbuf_release(&msg);
2951
2952 null = alloc_filespec(one->path);
2953 run_diff_cmd(NULL, name, other, attr_path,
2954 null, two, &msg, o, p);
2955 free(null);
2956 }
2957 else
2958 run_diff_cmd(pgm, name, other, attr_path,
2959 one, two, &msg, o, p);
2960
2961 strbuf_release(&msg);
2962 }
2963
2964 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2965 struct diffstat_t *diffstat)
2966 {
2967 const char *name;
2968 const char *other;
2969 int complete_rewrite = 0;
2970
2971 if (DIFF_PAIR_UNMERGED(p)) {
2972 /* unmerged */
2973 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2974 return;
2975 }
2976
2977 name = p->one->path;
2978 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2979
2980 if (o->prefix_length)
2981 strip_prefix(o->prefix_length, &name, &other);
2982
2983 diff_fill_sha1_info(p->one);
2984 diff_fill_sha1_info(p->two);
2985
2986 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2987 complete_rewrite = 1;
2988 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2989 }
2990
2991 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2992 {
2993 const char *name;
2994 const char *other;
2995 const char *attr_path;
2996
2997 if (DIFF_PAIR_UNMERGED(p)) {
2998 /* unmerged */
2999 return;
3000 }
3001
3002 name = p->one->path;
3003 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3004 attr_path = other ? other : name;
3005
3006 if (o->prefix_length)
3007 strip_prefix(o->prefix_length, &name, &other);
3008
3009 diff_fill_sha1_info(p->one);
3010 diff_fill_sha1_info(p->two);
3011
3012 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3013 }
3014
3015 void diff_setup(struct diff_options *options)
3016 {
3017 memcpy(options, &default_diff_options, sizeof(*options));
3018
3019 options->file = stdout;
3020
3021 options->line_termination = '\n';
3022 options->break_opt = -1;
3023 options->rename_limit = -1;
3024 options->dirstat_permille = diff_dirstat_permille_default;
3025 options->context = 3;
3026
3027 options->change = diff_change;
3028 options->add_remove = diff_addremove;
3029 options->use_color = diff_use_color_default;
3030 options->detect_rename = diff_detect_rename_default;
3031
3032 if (diff_no_prefix) {
3033 options->a_prefix = options->b_prefix = "";
3034 } else if (!diff_mnemonic_prefix) {
3035 options->a_prefix = "a/";
3036 options->b_prefix = "b/";
3037 }
3038 }
3039
3040 int diff_setup_done(struct diff_options *options)
3041 {
3042 int count = 0;
3043
3044 if (options->output_format & DIFF_FORMAT_NAME)
3045 count++;
3046 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3047 count++;
3048 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3049 count++;
3050 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3051 count++;
3052 if (count > 1)
3053 die("--name-only, --name-status, --check and -s are mutually exclusive");
3054
3055 /*
3056 * Most of the time we can say "there are changes"
3057 * only by checking if there are changed paths, but
3058 * --ignore-whitespace* options force us to look
3059 * inside contents.
3060 */
3061
3062 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3063 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3064 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3065 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3066 else
3067 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3068
3069 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3070 options->detect_rename = DIFF_DETECT_COPY;
3071
3072 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3073 options->prefix = NULL;
3074 if (options->prefix)
3075 options->prefix_length = strlen(options->prefix);
3076 else
3077 options->prefix_length = 0;
3078
3079 if (options->output_format & (DIFF_FORMAT_NAME |
3080 DIFF_FORMAT_NAME_STATUS |
3081 DIFF_FORMAT_CHECKDIFF |
3082 DIFF_FORMAT_NO_OUTPUT))
3083 options->output_format &= ~(DIFF_FORMAT_RAW |
3084 DIFF_FORMAT_NUMSTAT |
3085 DIFF_FORMAT_DIFFSTAT |
3086 DIFF_FORMAT_SHORTSTAT |
3087 DIFF_FORMAT_DIRSTAT |
3088 DIFF_FORMAT_SUMMARY |
3089 DIFF_FORMAT_PATCH);
3090
3091 /*
3092 * These cases always need recursive; we do not drop caller-supplied
3093 * recursive bits for other formats here.
3094 */
3095 if (options->output_format & (DIFF_FORMAT_PATCH |
3096 DIFF_FORMAT_NUMSTAT |
3097 DIFF_FORMAT_DIFFSTAT |
3098 DIFF_FORMAT_SHORTSTAT |
3099 DIFF_FORMAT_DIRSTAT |
3100 DIFF_FORMAT_SUMMARY |
3101 DIFF_FORMAT_CHECKDIFF))
3102 DIFF_OPT_SET(options, RECURSIVE);
3103 /*
3104 * Also pickaxe would not work very well if you do not say recursive
3105 */
3106 if (options->pickaxe)
3107 DIFF_OPT_SET(options, RECURSIVE);
3108 /*
3109 * When patches are generated, submodules diffed against the work tree
3110 * must be checked for dirtiness too so it can be shown in the output
3111 */
3112 if (options->output_format & DIFF_FORMAT_PATCH)
3113 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3114
3115 if (options->detect_rename && options->rename_limit < 0)
3116 options->rename_limit = diff_rename_limit_default;
3117 if (options->setup & DIFF_SETUP_USE_CACHE) {
3118 if (!active_cache)
3119 /* read-cache does not die even when it fails
3120 * so it is safe for us to do this here. Also
3121 * it does not smudge active_cache or active_nr
3122 * when it fails, so we do not have to worry about
3123 * cleaning it up ourselves either.
3124 */
3125 read_cache();
3126 }
3127 if (options->abbrev <= 0 || 40 < options->abbrev)
3128 options->abbrev = 40; /* full */
3129
3130 /*
3131 * It does not make sense to show the first hit we happened
3132 * to have found. It does not make sense not to return with
3133 * exit code in such a case either.
3134 */
3135 if (DIFF_OPT_TST(options, QUICK)) {
3136 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3137 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3138 }
3139
3140 return 0;
3141 }
3142
3143 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3144 {
3145 char c, *eq;
3146 int len;
3147
3148 if (*arg != '-')
3149 return 0;
3150 c = *++arg;
3151 if (!c)
3152 return 0;
3153 if (c == arg_short) {
3154 c = *++arg;
3155 if (!c)
3156 return 1;
3157 if (val && isdigit(c)) {
3158 char *end;
3159 int n = strtoul(arg, &end, 10);
3160 if (*end)
3161 return 0;
3162 *val = n;
3163 return 1;
3164 }
3165 return 0;
3166 }
3167 if (c != '-')
3168 return 0;
3169 arg++;
3170 eq = strchr(arg, '=');
3171 if (eq)
3172 len = eq - arg;
3173 else
3174 len = strlen(arg);
3175 if (!len || strncmp(arg, arg_long, len))
3176 return 0;
3177 if (eq) {
3178 int n;
3179 char *end;
3180 if (!isdigit(*++eq))
3181 return 0;
3182 n = strtoul(eq, &end, 10);
3183 if (*end)
3184 return 0;
3185 *val = n;
3186 }
3187 return 1;
3188 }
3189
3190 static int diff_scoreopt_parse(const char *opt);
3191
3192 static inline int short_opt(char opt, const char **argv,
3193 const char **optarg)
3194 {
3195 const char *arg = argv[0];
3196 if (arg[0] != '-' || arg[1] != opt)
3197 return 0;
3198 if (arg[2] != '\0') {
3199 *optarg = arg + 2;
3200 return 1;
3201 }
3202 if (!argv[1])
3203 die("Option '%c' requires a value", opt);
3204 *optarg = argv[1];
3205 return 2;
3206 }
3207
3208 int parse_long_opt(const char *opt, const char **argv,
3209 const char **optarg)
3210 {
3211 const char *arg = argv[0];
3212 if (arg[0] != '-' || arg[1] != '-')
3213 return 0;
3214 arg += strlen("--");
3215 if (prefixcmp(arg, opt))
3216 return 0;
3217 arg += strlen(opt);
3218 if (*arg == '=') { /* sticked form: --option=value */
3219 *optarg = arg + 1;
3220 return 1;
3221 }
3222 if (*arg != '\0')
3223 return 0;
3224 /* separate form: --option value */
3225 if (!argv[1])
3226 die("Option '--%s' requires a value", opt);
3227 *optarg = argv[1];
3228 return 2;
3229 }
3230
3231 static int stat_opt(struct diff_options *options, const char **av)
3232 {
3233 const char *arg = av[0];
3234 char *end;
3235 int width = options->stat_width;
3236 int name_width = options->stat_name_width;
3237 int count = options->stat_count;
3238 int argcount = 1;
3239
3240 arg += strlen("--stat");
3241 end = (char *)arg;
3242
3243 switch (*arg) {
3244 case '-':
3245 if (!prefixcmp(arg, "-width")) {
3246 arg += strlen("-width");
3247 if (*arg == '=')
3248 width = strtoul(arg + 1, &end, 10);
3249 else if (!*arg && !av[1])
3250 die("Option '--stat-width' requires a value");
3251 else if (!*arg) {
3252 width = strtoul(av[1], &end, 10);
3253 argcount = 2;
3254 }
3255 } else if (!prefixcmp(arg, "-name-width")) {
3256 arg += strlen("-name-width");
3257 if (*arg == '=')
3258 name_width = strtoul(arg + 1, &end, 10);
3259 else if (!*arg && !av[1])
3260 die("Option '--stat-name-width' requires a value");
3261 else if (!*arg) {
3262 name_width = strtoul(av[1], &end, 10);
3263 argcount = 2;
3264 }
3265 } else if (!prefixcmp(arg, "-count")) {
3266 arg += strlen("-count");
3267 if (*arg == '=')
3268 count = strtoul(arg + 1, &end, 10);
3269 else if (!*arg && !av[1])
3270 die("Option '--stat-count' requires a value");
3271 else if (!*arg) {
3272 count = strtoul(av[1], &end, 10);
3273 argcount = 2;
3274 }
3275 }
3276 break;
3277 case '=':
3278 width = strtoul(arg+1, &end, 10);
3279 if (*end == ',')
3280 name_width = strtoul(end+1, &end, 10);
3281 if (*end == ',')
3282 count = strtoul(end+1, &end, 10);
3283 }
3284
3285 /* Important! This checks all the error cases! */
3286 if (*end)
3287 return 0;
3288 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3289 options->stat_name_width = name_width;
3290 options->stat_width = width;
3291 options->stat_count = count;
3292 return argcount;
3293 }
3294
3295 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3296 {
3297 struct strbuf errmsg = STRBUF_INIT;
3298 if (parse_dirstat_params(options, params, &errmsg))
3299 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3300 errmsg.buf);
3301 strbuf_release(&errmsg);
3302 /*
3303 * The caller knows a dirstat-related option is given from the command
3304 * line; allow it to say "return this_function();"
3305 */
3306 options->output_format |= DIFF_FORMAT_DIRSTAT;
3307 return 1;
3308 }
3309
3310 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3311 {
3312 const char *arg = av[0];
3313 const char *optarg;
3314 int argcount;
3315
3316 /* Output format options */
3317 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3318 options->output_format |= DIFF_FORMAT_PATCH;
3319 else if (opt_arg(arg, 'U', "unified", &options->context))
3320 options->output_format |= DIFF_FORMAT_PATCH;
3321 else if (!strcmp(arg, "--raw"))
3322 options->output_format |= DIFF_FORMAT_RAW;
3323 else if (!strcmp(arg, "--patch-with-raw"))
3324 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3325 else if (!strcmp(arg, "--numstat"))
3326 options->output_format |= DIFF_FORMAT_NUMSTAT;
3327 else if (!strcmp(arg, "--shortstat"))
3328 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3329 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3330 return parse_dirstat_opt(options, "");
3331 else if (!prefixcmp(arg, "-X"))
3332 return parse_dirstat_opt(options, arg + 2);
3333 else if (!prefixcmp(arg, "--dirstat="))
3334 return parse_dirstat_opt(options, arg + 10);
3335 else if (!strcmp(arg, "--cumulative"))
3336 return parse_dirstat_opt(options, "cumulative");
3337 else if (!strcmp(arg, "--dirstat-by-file"))
3338 return parse_dirstat_opt(options, "files");
3339 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3340 parse_dirstat_opt(options, "files");
3341 return parse_dirstat_opt(options, arg + 18);
3342 }
3343 else if (!strcmp(arg, "--check"))
3344 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3345 else if (!strcmp(arg, "--summary"))
3346 options->output_format |= DIFF_FORMAT_SUMMARY;
3347 else if (!strcmp(arg, "--patch-with-stat"))
3348 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3349 else if (!strcmp(arg, "--name-only"))
3350 options->output_format |= DIFF_FORMAT_NAME;
3351 else if (!strcmp(arg, "--name-status"))
3352 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3353 else if (!strcmp(arg, "-s"))
3354 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3355 else if (!prefixcmp(arg, "--stat"))
3356 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3357 return stat_opt(options, av);
3358
3359 /* renames options */
3360 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3361 !strcmp(arg, "--break-rewrites")) {
3362 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3363 return error("invalid argument to -B: %s", arg+2);
3364 }
3365 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3366 !strcmp(arg, "--find-renames")) {
3367 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3368 return error("invalid argument to -M: %s", arg+2);
3369 options->detect_rename = DIFF_DETECT_RENAME;
3370 }
3371 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3372 options->irreversible_delete = 1;
3373 }
3374 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3375 !strcmp(arg, "--find-copies")) {
3376 if (options->detect_rename == DIFF_DETECT_COPY)
3377 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3378 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3379 return error("invalid argument to -C: %s", arg+2);
3380 options->detect_rename = DIFF_DETECT_COPY;
3381 }
3382 else if (!strcmp(arg, "--no-renames"))
3383 options->detect_rename = 0;
3384 else if (!strcmp(arg, "--relative"))
3385 DIFF_OPT_SET(options, RELATIVE_NAME);
3386 else if (!prefixcmp(arg, "--relative=")) {
3387 DIFF_OPT_SET(options, RELATIVE_NAME);
3388 options->prefix = arg + 11;
3389 }
3390
3391 /* xdiff options */
3392 else if (!strcmp(arg, "--minimal"))
3393 DIFF_XDL_SET(options, NEED_MINIMAL);
3394 else if (!strcmp(arg, "--no-minimal"))
3395 DIFF_XDL_CLR(options, NEED_MINIMAL);
3396 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3397 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3398 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3399 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3400 else if (!strcmp(arg, "--ignore-space-at-eol"))
3401 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3402 else if (!strcmp(arg, "--patience"))
3403 DIFF_XDL_SET(options, PATIENCE_DIFF);
3404 else if (!strcmp(arg, "--histogram"))
3405 DIFF_XDL_SET(options, HISTOGRAM_DIFF);
3406
3407 /* flags options */
3408 else if (!strcmp(arg, "--binary")) {
3409 options->output_format |= DIFF_FORMAT_PATCH;
3410 DIFF_OPT_SET(options, BINARY);
3411 }
3412 else if (!strcmp(arg, "--full-index"))
3413 DIFF_OPT_SET(options, FULL_INDEX);
3414 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3415 DIFF_OPT_SET(options, TEXT);
3416 else if (!strcmp(arg, "-R"))
3417 DIFF_OPT_SET(options, REVERSE_DIFF);
3418 else if (!strcmp(arg, "--find-copies-harder"))
3419 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3420 else if (!strcmp(arg, "--follow"))
3421 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3422 else if (!strcmp(arg, "--color"))
3423 options->use_color = 1;
3424 else if (!prefixcmp(arg, "--color=")) {
3425 int value = git_config_colorbool(NULL, arg+8);
3426 if (value < 0)
3427 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3428 options->use_color = value;
3429 }
3430 else if (!strcmp(arg, "--no-color"))
3431 options->use_color = 0;
3432 else if (!strcmp(arg, "--color-words")) {
3433 options->use_color = 1;
3434 options->word_diff = DIFF_WORDS_COLOR;
3435 }
3436 else if (!prefixcmp(arg, "--color-words=")) {
3437 options->use_color = 1;
3438 options->word_diff = DIFF_WORDS_COLOR;
3439 options->word_regex = arg + 14;
3440 }
3441 else if (!strcmp(arg, "--word-diff")) {
3442 if (options->word_diff == DIFF_WORDS_NONE)
3443 options->word_diff = DIFF_WORDS_PLAIN;
3444 }
3445 else if (!prefixcmp(arg, "--word-diff=")) {
3446 const char *type = arg + 12;
3447 if (!strcmp(type, "plain"))
3448 options->word_diff = DIFF_WORDS_PLAIN;
3449 else if (!strcmp(type, "color")) {
3450 options->use_color = 1;
3451 options->word_diff = DIFF_WORDS_COLOR;
3452 }
3453 else if (!strcmp(type, "porcelain"))
3454 options->word_diff = DIFF_WORDS_PORCELAIN;
3455 else if (!strcmp(type, "none"))
3456 options->word_diff = DIFF_WORDS_NONE;
3457 else
3458 die("bad --word-diff argument: %s", type);
3459 }
3460 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3461 if (options->word_diff == DIFF_WORDS_NONE)
3462 options->word_diff = DIFF_WORDS_PLAIN;
3463 options->word_regex = optarg;
3464 return argcount;
3465 }
3466 else if (!strcmp(arg, "--exit-code"))
3467 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3468 else if (!strcmp(arg, "--quiet"))
3469 DIFF_OPT_SET(options, QUICK);
3470 else if (!strcmp(arg, "--ext-diff"))
3471 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3472 else if (!strcmp(arg, "--no-ext-diff"))
3473 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3474 else if (!strcmp(arg, "--textconv"))
3475 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3476 else if (!strcmp(arg, "--no-textconv"))
3477 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3478 else if (!strcmp(arg, "--ignore-submodules")) {
3479 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3480 handle_ignore_submodules_arg(options, "all");
3481 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3482 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3483 handle_ignore_submodules_arg(options, arg + 20);
3484 } else if (!strcmp(arg, "--submodule"))
3485 DIFF_OPT_SET(options, SUBMODULE_LOG);
3486 else if (!prefixcmp(arg, "--submodule=")) {
3487 if (!strcmp(arg + 12, "log"))
3488 DIFF_OPT_SET(options, SUBMODULE_LOG);
3489 }
3490
3491 /* misc options */
3492 else if (!strcmp(arg, "-z"))
3493 options->line_termination = 0;
3494 else if ((argcount = short_opt('l', av, &optarg))) {
3495 options->rename_limit = strtoul(optarg, NULL, 10);
3496 return argcount;
3497 }
3498 else if ((argcount = short_opt('S', av, &optarg))) {
3499 options->pickaxe = optarg;
3500 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3501 return argcount;
3502 } else if ((argcount = short_opt('G', av, &optarg))) {
3503 options->pickaxe = optarg;
3504 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3505 return argcount;
3506 }
3507 else if (!strcmp(arg, "--pickaxe-all"))
3508 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3509 else if (!strcmp(arg, "--pickaxe-regex"))
3510 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3511 else if ((argcount = short_opt('O', av, &optarg))) {
3512 options->orderfile = optarg;
3513 return argcount;
3514 }
3515 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3516 options->filter = optarg;
3517 return argcount;
3518 }
3519 else if (!strcmp(arg, "--abbrev"))
3520 options->abbrev = DEFAULT_ABBREV;
3521 else if (!prefixcmp(arg, "--abbrev=")) {
3522 options->abbrev = strtoul(arg + 9, NULL, 10);
3523 if (options->abbrev < MINIMUM_ABBREV)
3524 options->abbrev = MINIMUM_ABBREV;
3525 else if (40 < options->abbrev)
3526 options->abbrev = 40;
3527 }
3528 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3529 options->a_prefix = optarg;
3530 return argcount;
3531 }
3532 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3533 options->b_prefix = optarg;
3534 return argcount;
3535 }
3536 else if (!strcmp(arg, "--no-prefix"))
3537 options->a_prefix = options->b_prefix = "";
3538 else if (opt_arg(arg, '\0', "inter-hunk-context",
3539 &options->interhunkcontext))
3540 ;
3541 else if (!strcmp(arg, "-W"))
3542 DIFF_OPT_SET(options, FUNCCONTEXT);
3543 else if (!strcmp(arg, "--function-context"))
3544 DIFF_OPT_SET(options, FUNCCONTEXT);
3545 else if (!strcmp(arg, "--no-function-context"))
3546 DIFF_OPT_CLR(options, FUNCCONTEXT);
3547 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3548 options->file = fopen(optarg, "w");
3549 if (!options->file)
3550 die_errno("Could not open '%s'", optarg);
3551 options->close_file = 1;
3552 return argcount;
3553 } else
3554 return 0;
3555 return 1;
3556 }
3557
3558 int parse_rename_score(const char **cp_p)
3559 {
3560 unsigned long num, scale;
3561 int ch, dot;
3562 const char *cp = *cp_p;
3563
3564 num = 0;
3565 scale = 1;
3566 dot = 0;
3567 for (;;) {
3568 ch = *cp;
3569 if ( !dot && ch == '.' ) {
3570 scale = 1;
3571 dot = 1;
3572 } else if ( ch == '%' ) {
3573 scale = dot ? scale*100 : 100;
3574 cp++; /* % is always at the end */
3575 break;
3576 } else if ( ch >= '0' && ch <= '9' ) {
3577 if ( scale < 100000 ) {
3578 scale *= 10;
3579 num = (num*10) + (ch-'0');
3580 }
3581 } else {
3582 break;
3583 }
3584 cp++;
3585 }
3586 *cp_p = cp;
3587
3588 /* user says num divided by scale and we say internally that
3589 * is MAX_SCORE * num / scale.
3590 */
3591 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3592 }
3593
3594 static int diff_scoreopt_parse(const char *opt)
3595 {
3596 int opt1, opt2, cmd;
3597
3598 if (*opt++ != '-')
3599 return -1;
3600 cmd = *opt++;
3601 if (cmd == '-') {
3602 /* convert the long-form arguments into short-form versions */
3603 if (!prefixcmp(opt, "break-rewrites")) {
3604 opt += strlen("break-rewrites");
3605 if (*opt == 0 || *opt++ == '=')
3606 cmd = 'B';
3607 } else if (!prefixcmp(opt, "find-copies")) {
3608 opt += strlen("find-copies");
3609 if (*opt == 0 || *opt++ == '=')
3610 cmd = 'C';
3611 } else if (!prefixcmp(opt, "find-renames")) {
3612 opt += strlen("find-renames");
3613 if (*opt == 0 || *opt++ == '=')
3614 cmd = 'M';
3615 }
3616 }
3617 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3618 return -1; /* that is not a -M, -C nor -B option */
3619
3620 opt1 = parse_rename_score(&opt);
3621 if (cmd != 'B')
3622 opt2 = 0;
3623 else {
3624 if (*opt == 0)
3625 opt2 = 0;
3626 else if (*opt != '/')
3627 return -1; /* we expect -B80/99 or -B80 */
3628 else {
3629 opt++;
3630 opt2 = parse_rename_score(&opt);
3631 }
3632 }
3633 if (*opt != 0)
3634 return -1;
3635 return opt1 | (opt2 << 16);
3636 }
3637
3638 struct diff_queue_struct diff_queued_diff;
3639
3640 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3641 {
3642 if (queue->alloc <= queue->nr) {
3643 queue->alloc = alloc_nr(queue->alloc);
3644 queue->queue = xrealloc(queue->queue,
3645 sizeof(dp) * queue->alloc);
3646 }
3647 queue->queue[queue->nr++] = dp;
3648 }
3649
3650 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3651 struct diff_filespec *one,
3652 struct diff_filespec *two)
3653 {
3654 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3655 dp->one = one;
3656 dp->two = two;
3657 if (queue)
3658 diff_q(queue, dp);
3659 return dp;
3660 }
3661
3662 void diff_free_filepair(struct diff_filepair *p)
3663 {
3664 free_filespec(p->one);
3665 free_filespec(p->two);
3666 free(p);
3667 }
3668
3669 /* This is different from find_unique_abbrev() in that
3670 * it stuffs the result with dots for alignment.
3671 */
3672 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3673 {
3674 int abblen;
3675 const char *abbrev;
3676 if (len == 40)
3677 return sha1_to_hex(sha1);
3678
3679 abbrev = find_unique_abbrev(sha1, len);
3680 abblen = strlen(abbrev);
3681 if (abblen < 37) {
3682 static char hex[41];
3683 if (len < abblen && abblen <= len + 2)
3684 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3685 else
3686 sprintf(hex, "%s...", abbrev);
3687 return hex;
3688 }
3689 return sha1_to_hex(sha1);
3690 }
3691
3692 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3693 {
3694 int line_termination = opt->line_termination;
3695 int inter_name_termination = line_termination ? '\t' : '\0';
3696 if (opt->output_prefix) {
3697 struct strbuf *msg = NULL;
3698 msg = opt->output_prefix(opt, opt->output_prefix_data);
3699 fprintf(opt->file, "%s", msg->buf);
3700 }
3701
3702 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3703 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3704 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3705 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3706 }
3707 if (p->score) {
3708 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3709 inter_name_termination);
3710 } else {
3711 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3712 }
3713
3714 if (p->status == DIFF_STATUS_COPIED ||
3715 p->status == DIFF_STATUS_RENAMED) {
3716 const char *name_a, *name_b;
3717 name_a = p->one->path;
3718 name_b = p->two->path;
3719 strip_prefix(opt->prefix_length, &name_a, &name_b);
3720 write_name_quoted(name_a, opt->file, inter_name_termination);
3721 write_name_quoted(name_b, opt->file, line_termination);
3722 } else {
3723 const char *name_a, *name_b;
3724 name_a = p->one->mode ? p->one->path : p->two->path;
3725 name_b = NULL;
3726 strip_prefix(opt->prefix_length, &name_a, &name_b);
3727 write_name_quoted(name_a, opt->file, line_termination);
3728 }
3729 }
3730
3731 int diff_unmodified_pair(struct diff_filepair *p)
3732 {
3733 /* This function is written stricter than necessary to support
3734 * the currently implemented transformers, but the idea is to
3735 * let transformers to produce diff_filepairs any way they want,
3736 * and filter and clean them up here before producing the output.
3737 */
3738 struct diff_filespec *one = p->one, *two = p->two;
3739
3740 if (DIFF_PAIR_UNMERGED(p))
3741 return 0; /* unmerged is interesting */
3742
3743 /* deletion, addition, mode or type change
3744 * and rename are all interesting.
3745 */
3746 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3747 DIFF_PAIR_MODE_CHANGED(p) ||
3748 strcmp(one->path, two->path))
3749 return 0;
3750
3751 /* both are valid and point at the same path. that is, we are
3752 * dealing with a change.
3753 */
3754 if (one->sha1_valid && two->sha1_valid &&
3755 !hashcmp(one->sha1, two->sha1) &&
3756 !one->dirty_submodule && !two->dirty_submodule)
3757 return 1; /* no change */
3758 if (!one->sha1_valid && !two->sha1_valid)
3759 return 1; /* both look at the same file on the filesystem. */
3760 return 0;
3761 }
3762
3763 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3764 {
3765 if (diff_unmodified_pair(p))
3766 return;
3767
3768 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3769 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3770 return; /* no tree diffs in patch format */
3771
3772 run_diff(p, o);
3773 }
3774
3775 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3776 struct diffstat_t *diffstat)
3777 {
3778 if (diff_unmodified_pair(p))
3779 return;
3780
3781 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3782 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3783 return; /* no useful stat for tree diffs */
3784
3785 run_diffstat(p, o, diffstat);
3786 }
3787
3788 static void diff_flush_checkdiff(struct diff_filepair *p,
3789 struct diff_options *o)
3790 {
3791 if (diff_unmodified_pair(p))
3792 return;
3793
3794 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3795 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3796 return; /* nothing to check in tree diffs */
3797
3798 run_checkdiff(p, o);
3799 }
3800
3801 int diff_queue_is_empty(void)
3802 {
3803 struct diff_queue_struct *q = &diff_queued_diff;
3804 int i;
3805 for (i = 0; i < q->nr; i++)
3806 if (!diff_unmodified_pair(q->queue[i]))
3807 return 0;
3808 return 1;
3809 }
3810
3811 #if DIFF_DEBUG
3812 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3813 {
3814 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3815 x, one ? one : "",
3816 s->path,
3817 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3818 s->mode,
3819 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3820 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3821 x, one ? one : "",
3822 s->size, s->xfrm_flags);
3823 }
3824
3825 void diff_debug_filepair(const struct diff_filepair *p, int i)
3826 {
3827 diff_debug_filespec(p->one, i, "one");
3828 diff_debug_filespec(p->two, i, "two");
3829 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3830 p->score, p->status ? p->status : '?',
3831 p->one->rename_used, p->broken_pair);
3832 }
3833
3834 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3835 {
3836 int i;
3837 if (msg)
3838 fprintf(stderr, "%s\n", msg);
3839 fprintf(stderr, "q->nr = %d\n", q->nr);
3840 for (i = 0; i < q->nr; i++) {
3841 struct diff_filepair *p = q->queue[i];
3842 diff_debug_filepair(p, i);
3843 }
3844 }
3845 #endif
3846
3847 static void diff_resolve_rename_copy(void)
3848 {
3849 int i;
3850 struct diff_filepair *p;
3851 struct diff_queue_struct *q = &diff_queued_diff;
3852
3853 diff_debug_queue("resolve-rename-copy", q);
3854
3855 for (i = 0; i < q->nr; i++) {
3856 p = q->queue[i];
3857 p->status = 0; /* undecided */
3858 if (DIFF_PAIR_UNMERGED(p))
3859 p->status = DIFF_STATUS_UNMERGED;
3860 else if (!DIFF_FILE_VALID(p->one))
3861 p->status = DIFF_STATUS_ADDED;
3862 else if (!DIFF_FILE_VALID(p->two))
3863 p->status = DIFF_STATUS_DELETED;
3864 else if (DIFF_PAIR_TYPE_CHANGED(p))
3865 p->status = DIFF_STATUS_TYPE_CHANGED;
3866
3867 /* from this point on, we are dealing with a pair
3868 * whose both sides are valid and of the same type, i.e.
3869 * either in-place edit or rename/copy edit.
3870 */
3871 else if (DIFF_PAIR_RENAME(p)) {
3872 /*
3873 * A rename might have re-connected a broken
3874 * pair up, causing the pathnames to be the
3875 * same again. If so, that's not a rename at
3876 * all, just a modification..
3877 *
3878 * Otherwise, see if this source was used for
3879 * multiple renames, in which case we decrement
3880 * the count, and call it a copy.
3881 */
3882 if (!strcmp(p->one->path, p->two->path))
3883 p->status = DIFF_STATUS_MODIFIED;
3884 else if (--p->one->rename_used > 0)
3885 p->status = DIFF_STATUS_COPIED;
3886 else
3887 p->status = DIFF_STATUS_RENAMED;
3888 }
3889 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3890 p->one->mode != p->two->mode ||
3891 p->one->dirty_submodule ||
3892 p->two->dirty_submodule ||
3893 is_null_sha1(p->one->sha1))
3894 p->status = DIFF_STATUS_MODIFIED;
3895 else {
3896 /* This is a "no-change" entry and should not
3897 * happen anymore, but prepare for broken callers.
3898 */
3899 error("feeding unmodified %s to diffcore",
3900 p->one->path);
3901 p->status = DIFF_STATUS_UNKNOWN;
3902 }
3903 }
3904 diff_debug_queue("resolve-rename-copy done", q);
3905 }
3906
3907 static int check_pair_status(struct diff_filepair *p)
3908 {
3909 switch (p->status) {
3910 case DIFF_STATUS_UNKNOWN:
3911 return 0;
3912 case 0:
3913 die("internal error in diff-resolve-rename-copy");
3914 default:
3915 return 1;
3916 }
3917 }
3918
3919 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3920 {
3921 int fmt = opt->output_format;
3922
3923 if (fmt & DIFF_FORMAT_CHECKDIFF)
3924 diff_flush_checkdiff(p, opt);
3925 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3926 diff_flush_raw(p, opt);
3927 else if (fmt & DIFF_FORMAT_NAME) {
3928 const char *name_a, *name_b;
3929 name_a = p->two->path;
3930 name_b = NULL;
3931 strip_prefix(opt->prefix_length, &name_a, &name_b);
3932 write_name_quoted(name_a, opt->file, opt->line_termination);
3933 }
3934 }
3935
3936 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3937 {
3938 if (fs->mode)
3939 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3940 else
3941 fprintf(file, " %s ", newdelete);
3942 write_name_quoted(fs->path, file, '\n');
3943 }
3944
3945
3946 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
3947 const char *line_prefix)
3948 {
3949 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3950 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
3951 p->two->mode, show_name ? ' ' : '\n');
3952 if (show_name) {
3953 write_name_quoted(p->two->path, file, '\n');
3954 }
3955 }
3956 }
3957
3958 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
3959 const char *line_prefix)
3960 {
3961 char *names = pprint_rename(p->one->path, p->two->path);
3962
3963 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3964 free(names);
3965 show_mode_change(file, p, 0, line_prefix);
3966 }
3967
3968 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
3969 {
3970 FILE *file = opt->file;
3971 char *line_prefix = "";
3972
3973 if (opt->output_prefix) {
3974 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
3975 line_prefix = buf->buf;
3976 }
3977
3978 switch(p->status) {
3979 case DIFF_STATUS_DELETED:
3980 fputs(line_prefix, file);
3981 show_file_mode_name(file, "delete", p->one);
3982 break;
3983 case DIFF_STATUS_ADDED:
3984 fputs(line_prefix, file);
3985 show_file_mode_name(file, "create", p->two);
3986 break;
3987 case DIFF_STATUS_COPIED:
3988 fputs(line_prefix, file);
3989 show_rename_copy(file, "copy", p, line_prefix);
3990 break;
3991 case DIFF_STATUS_RENAMED:
3992 fputs(line_prefix, file);
3993 show_rename_copy(file, "rename", p, line_prefix);
3994 break;
3995 default:
3996 if (p->score) {
3997 fprintf(file, "%s rewrite ", line_prefix);
3998 write_name_quoted(p->two->path, file, ' ');
3999 fprintf(file, "(%d%%)\n", similarity_index(p));
4000 }
4001 show_mode_change(file, p, !p->score, line_prefix);
4002 break;
4003 }
4004 }
4005
4006 struct patch_id_t {
4007 git_SHA_CTX *ctx;
4008 int patchlen;
4009 };
4010
4011 static int remove_space(char *line, int len)
4012 {
4013 int i;
4014 char *dst = line;
4015 unsigned char c;
4016
4017 for (i = 0; i < len; i++)
4018 if (!isspace((c = line[i])))
4019 *dst++ = c;
4020
4021 return dst - line;
4022 }
4023
4024 static void patch_id_consume(void *priv, char *line, unsigned long len)
4025 {
4026 struct patch_id_t *data = priv;
4027 int new_len;
4028
4029 /* Ignore line numbers when computing the SHA1 of the patch */
4030 if (!prefixcmp(line, "@@ -"))
4031 return;
4032
4033 new_len = remove_space(line, len);
4034
4035 git_SHA1_Update(data->ctx, line, new_len);
4036 data->patchlen += new_len;
4037 }
4038
4039 /* returns 0 upon success, and writes result into sha1 */
4040 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4041 {
4042 struct diff_queue_struct *q = &diff_queued_diff;
4043 int i;
4044 git_SHA_CTX ctx;
4045 struct patch_id_t data;
4046 char buffer[PATH_MAX * 4 + 20];
4047
4048 git_SHA1_Init(&ctx);
4049 memset(&data, 0, sizeof(struct patch_id_t));
4050 data.ctx = &ctx;
4051
4052 for (i = 0; i < q->nr; i++) {
4053 xpparam_t xpp;
4054 xdemitconf_t xecfg;
4055 mmfile_t mf1, mf2;
4056 struct diff_filepair *p = q->queue[i];
4057 int len1, len2;
4058
4059 memset(&xpp, 0, sizeof(xpp));
4060 memset(&xecfg, 0, sizeof(xecfg));
4061 if (p->status == 0)
4062 return error("internal diff status error");
4063 if (p->status == DIFF_STATUS_UNKNOWN)
4064 continue;
4065 if (diff_unmodified_pair(p))
4066 continue;
4067 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4068 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4069 continue;
4070 if (DIFF_PAIR_UNMERGED(p))
4071 continue;
4072
4073 diff_fill_sha1_info(p->one);
4074 diff_fill_sha1_info(p->two);
4075 if (fill_mmfile(&mf1, p->one) < 0 ||
4076 fill_mmfile(&mf2, p->two) < 0)
4077 return error("unable to read files to diff");
4078
4079 len1 = remove_space(p->one->path, strlen(p->one->path));
4080 len2 = remove_space(p->two->path, strlen(p->two->path));
4081 if (p->one->mode == 0)
4082 len1 = snprintf(buffer, sizeof(buffer),
4083 "diff--gita/%.*sb/%.*s"
4084 "newfilemode%06o"
4085 "---/dev/null"
4086 "+++b/%.*s",
4087 len1, p->one->path,
4088 len2, p->two->path,
4089 p->two->mode,
4090 len2, p->two->path);
4091 else if (p->two->mode == 0)
4092 len1 = snprintf(buffer, sizeof(buffer),
4093 "diff--gita/%.*sb/%.*s"
4094 "deletedfilemode%06o"
4095 "---a/%.*s"
4096 "+++/dev/null",
4097 len1, p->one->path,
4098 len2, p->two->path,
4099 p->one->mode,
4100 len1, p->one->path);
4101 else
4102 len1 = snprintf(buffer, sizeof(buffer),
4103 "diff--gita/%.*sb/%.*s"
4104 "---a/%.*s"
4105 "+++b/%.*s",
4106 len1, p->one->path,
4107 len2, p->two->path,
4108 len1, p->one->path,
4109 len2, p->two->path);
4110 git_SHA1_Update(&ctx, buffer, len1);
4111
4112 if (diff_filespec_is_binary(p->one) ||
4113 diff_filespec_is_binary(p->two)) {
4114 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4115 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4116 continue;
4117 }
4118
4119 xpp.flags = 0;
4120 xecfg.ctxlen = 3;
4121 xecfg.flags = 0;
4122 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4123 &xpp, &xecfg);
4124 }
4125
4126 git_SHA1_Final(sha1, &ctx);
4127 return 0;
4128 }
4129
4130 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4131 {
4132 struct diff_queue_struct *q = &diff_queued_diff;
4133 int i;
4134 int result = diff_get_patch_id(options, sha1);
4135
4136 for (i = 0; i < q->nr; i++)
4137 diff_free_filepair(q->queue[i]);
4138
4139 free(q->queue);
4140 DIFF_QUEUE_CLEAR(q);
4141
4142 return result;
4143 }
4144
4145 static int is_summary_empty(const struct diff_queue_struct *q)
4146 {
4147 int i;
4148
4149 for (i = 0; i < q->nr; i++) {
4150 const struct diff_filepair *p = q->queue[i];
4151
4152 switch (p->status) {
4153 case DIFF_STATUS_DELETED:
4154 case DIFF_STATUS_ADDED:
4155 case DIFF_STATUS_COPIED:
4156 case DIFF_STATUS_RENAMED:
4157 return 0;
4158 default:
4159 if (p->score)
4160 return 0;
4161 if (p->one->mode && p->two->mode &&
4162 p->one->mode != p->two->mode)
4163 return 0;
4164 break;
4165 }
4166 }
4167 return 1;
4168 }
4169
4170 static const char rename_limit_warning[] =
4171 "inexact rename detection was skipped due to too many files.";
4172
4173 static const char degrade_cc_to_c_warning[] =
4174 "only found copies from modified paths due to too many files.";
4175
4176 static const char rename_limit_advice[] =
4177 "you may want to set your %s variable to at least "
4178 "%d and retry the command.";
4179
4180 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4181 {
4182 if (degraded_cc)
4183 warning(degrade_cc_to_c_warning);
4184 else if (needed)
4185 warning(rename_limit_warning);
4186 else
4187 return;
4188 if (0 < needed && needed < 32767)
4189 warning(rename_limit_advice, varname, needed);
4190 }
4191
4192 void diff_flush(struct diff_options *options)
4193 {
4194 struct diff_queue_struct *q = &diff_queued_diff;
4195 int i, output_format = options->output_format;
4196 int separator = 0;
4197 int dirstat_by_line = 0;
4198
4199 /*
4200 * Order: raw, stat, summary, patch
4201 * or: name/name-status/checkdiff (other bits clear)
4202 */
4203 if (!q->nr)
4204 goto free_queue;
4205
4206 if (output_format & (DIFF_FORMAT_RAW |
4207 DIFF_FORMAT_NAME |
4208 DIFF_FORMAT_NAME_STATUS |
4209 DIFF_FORMAT_CHECKDIFF)) {
4210 for (i = 0; i < q->nr; i++) {
4211 struct diff_filepair *p = q->queue[i];
4212 if (check_pair_status(p))
4213 flush_one_pair(p, options);
4214 }
4215 separator++;
4216 }
4217
4218 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4219 dirstat_by_line = 1;
4220
4221 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4222 dirstat_by_line) {
4223 struct diffstat_t diffstat;
4224
4225 memset(&diffstat, 0, sizeof(struct diffstat_t));
4226 for (i = 0; i < q->nr; i++) {
4227 struct diff_filepair *p = q->queue[i];
4228 if (check_pair_status(p))
4229 diff_flush_stat(p, options, &diffstat);
4230 }
4231 if (output_format & DIFF_FORMAT_NUMSTAT)
4232 show_numstat(&diffstat, options);
4233 if (output_format & DIFF_FORMAT_DIFFSTAT)
4234 show_stats(&diffstat, options);
4235 if (output_format & DIFF_FORMAT_SHORTSTAT)
4236 show_shortstats(&diffstat, options);
4237 if (output_format & DIFF_FORMAT_DIRSTAT)
4238 show_dirstat_by_line(&diffstat, options);
4239 free_diffstat_info(&diffstat);
4240 separator++;
4241 }
4242 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4243 show_dirstat(options);
4244
4245 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4246 for (i = 0; i < q->nr; i++) {
4247 diff_summary(options, q->queue[i]);
4248 }
4249 separator++;
4250 }
4251
4252 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4253 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4254 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4255 /*
4256 * run diff_flush_patch for the exit status. setting
4257 * options->file to /dev/null should be safe, becaue we
4258 * aren't supposed to produce any output anyway.
4259 */
4260 if (options->close_file)
4261 fclose(options->file);
4262 options->file = fopen("/dev/null", "w");
4263 if (!options->file)
4264 die_errno("Could not open /dev/null");
4265 options->close_file = 1;
4266 for (i = 0; i < q->nr; i++) {
4267 struct diff_filepair *p = q->queue[i];
4268 if (check_pair_status(p))
4269 diff_flush_patch(p, options);
4270 if (options->found_changes)
4271 break;
4272 }
4273 }
4274
4275 if (output_format & DIFF_FORMAT_PATCH) {
4276 if (separator) {
4277 putc(options->line_termination, options->file);
4278 if (options->stat_sep) {
4279 /* attach patch instead of inline */
4280 fputs(options->stat_sep, options->file);
4281 }
4282 }
4283
4284 for (i = 0; i < q->nr; i++) {
4285 struct diff_filepair *p = q->queue[i];
4286 if (check_pair_status(p))
4287 diff_flush_patch(p, options);
4288 }
4289 }
4290
4291 if (output_format & DIFF_FORMAT_CALLBACK)
4292 options->format_callback(q, options, options->format_callback_data);
4293
4294 for (i = 0; i < q->nr; i++)
4295 diff_free_filepair(q->queue[i]);
4296 free_queue:
4297 free(q->queue);
4298 DIFF_QUEUE_CLEAR(q);
4299 if (options->close_file)
4300 fclose(options->file);
4301
4302 /*
4303 * Report the content-level differences with HAS_CHANGES;
4304 * diff_addremove/diff_change does not set the bit when
4305 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4306 */
4307 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4308 if (options->found_changes)
4309 DIFF_OPT_SET(options, HAS_CHANGES);
4310 else
4311 DIFF_OPT_CLR(options, HAS_CHANGES);
4312 }
4313 }
4314
4315 static void diffcore_apply_filter(const char *filter)
4316 {
4317 int i;
4318 struct diff_queue_struct *q = &diff_queued_diff;
4319 struct diff_queue_struct outq;
4320 DIFF_QUEUE_CLEAR(&outq);
4321
4322 if (!filter)
4323 return;
4324
4325 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4326 int found;
4327 for (i = found = 0; !found && i < q->nr; i++) {
4328 struct diff_filepair *p = q->queue[i];
4329 if (((p->status == DIFF_STATUS_MODIFIED) &&
4330 ((p->score &&
4331 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4332 (!p->score &&
4333 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4334 ((p->status != DIFF_STATUS_MODIFIED) &&
4335 strchr(filter, p->status)))
4336 found++;
4337 }
4338 if (found)
4339 return;
4340
4341 /* otherwise we will clear the whole queue
4342 * by copying the empty outq at the end of this
4343 * function, but first clear the current entries
4344 * in the queue.
4345 */
4346 for (i = 0; i < q->nr; i++)
4347 diff_free_filepair(q->queue[i]);
4348 }
4349 else {
4350 /* Only the matching ones */
4351 for (i = 0; i < q->nr; i++) {
4352 struct diff_filepair *p = q->queue[i];
4353
4354 if (((p->status == DIFF_STATUS_MODIFIED) &&
4355 ((p->score &&
4356 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4357 (!p->score &&
4358 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4359 ((p->status != DIFF_STATUS_MODIFIED) &&
4360 strchr(filter, p->status)))
4361 diff_q(&outq, p);
4362 else
4363 diff_free_filepair(p);
4364 }
4365 }
4366 free(q->queue);
4367 *q = outq;
4368 }
4369
4370 /* Check whether two filespecs with the same mode and size are identical */
4371 static int diff_filespec_is_identical(struct diff_filespec *one,
4372 struct diff_filespec *two)
4373 {
4374 if (S_ISGITLINK(one->mode))
4375 return 0;
4376 if (diff_populate_filespec(one, 0))
4377 return 0;
4378 if (diff_populate_filespec(two, 0))
4379 return 0;
4380 return !memcmp(one->data, two->data, one->size);
4381 }
4382
4383 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4384 {
4385 int i;
4386 struct diff_queue_struct *q = &diff_queued_diff;
4387 struct diff_queue_struct outq;
4388 DIFF_QUEUE_CLEAR(&outq);
4389
4390 for (i = 0; i < q->nr; i++) {
4391 struct diff_filepair *p = q->queue[i];
4392
4393 /*
4394 * 1. Entries that come from stat info dirtiness
4395 * always have both sides (iow, not create/delete),
4396 * one side of the object name is unknown, with
4397 * the same mode and size. Keep the ones that
4398 * do not match these criteria. They have real
4399 * differences.
4400 *
4401 * 2. At this point, the file is known to be modified,
4402 * with the same mode and size, and the object
4403 * name of one side is unknown. Need to inspect
4404 * the identical contents.
4405 */
4406 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4407 !DIFF_FILE_VALID(p->two) ||
4408 (p->one->sha1_valid && p->two->sha1_valid) ||
4409 (p->one->mode != p->two->mode) ||
4410 diff_populate_filespec(p->one, 1) ||
4411 diff_populate_filespec(p->two, 1) ||
4412 (p->one->size != p->two->size) ||
4413 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4414 diff_q(&outq, p);
4415 else {
4416 /*
4417 * The caller can subtract 1 from skip_stat_unmatch
4418 * to determine how many paths were dirty only
4419 * due to stat info mismatch.
4420 */
4421 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4422 diffopt->skip_stat_unmatch++;
4423 diff_free_filepair(p);
4424 }
4425 }
4426 free(q->queue);
4427 *q = outq;
4428 }
4429
4430 static int diffnamecmp(const void *a_, const void *b_)
4431 {
4432 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4433 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4434 const char *name_a, *name_b;
4435
4436 name_a = a->one ? a->one->path : a->two->path;
4437 name_b = b->one ? b->one->path : b->two->path;
4438 return strcmp(name_a, name_b);
4439 }
4440
4441 void diffcore_fix_diff_index(struct diff_options *options)
4442 {
4443 struct diff_queue_struct *q = &diff_queued_diff;
4444 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4445 }
4446
4447 void diffcore_std(struct diff_options *options)
4448 {
4449 if (options->skip_stat_unmatch)
4450 diffcore_skip_stat_unmatch(options);
4451 if (!options->found_follow) {
4452 /* See try_to_follow_renames() in tree-diff.c */
4453 if (options->break_opt != -1)
4454 diffcore_break(options->break_opt);
4455 if (options->detect_rename)
4456 diffcore_rename(options);
4457 if (options->break_opt != -1)
4458 diffcore_merge_broken();
4459 }
4460 if (options->pickaxe)
4461 diffcore_pickaxe(options);
4462 if (options->orderfile)
4463 diffcore_order(options->orderfile);
4464 if (!options->found_follow)
4465 /* See try_to_follow_renames() in tree-diff.c */
4466 diff_resolve_rename_copy();
4467 diffcore_apply_filter(options->filter);
4468
4469 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4470 DIFF_OPT_SET(options, HAS_CHANGES);
4471 else
4472 DIFF_OPT_CLR(options, HAS_CHANGES);
4473
4474 options->found_follow = 0;
4475 }
4476
4477 int diff_result_code(struct diff_options *opt, int status)
4478 {
4479 int result = 0;
4480
4481 diff_warn_rename_limit("diff.renamelimit",
4482 opt->needed_rename_limit,
4483 opt->degraded_cc_to_c);
4484 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4485 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4486 return status;
4487 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4488 DIFF_OPT_TST(opt, HAS_CHANGES))
4489 result |= 01;
4490 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4491 DIFF_OPT_TST(opt, CHECK_FAILED))
4492 result |= 02;
4493 return result;
4494 }
4495
4496 int diff_can_quit_early(struct diff_options *opt)
4497 {
4498 return (DIFF_OPT_TST(opt, QUICK) &&
4499 !opt->filter &&
4500 DIFF_OPT_TST(opt, HAS_CHANGES));
4501 }
4502
4503 /*
4504 * Shall changes to this submodule be ignored?
4505 *
4506 * Submodule changes can be configured to be ignored separately for each path,
4507 * but that configuration can be overridden from the command line.
4508 */
4509 static int is_submodule_ignored(const char *path, struct diff_options *options)
4510 {
4511 int ignored = 0;
4512 unsigned orig_flags = options->flags;
4513 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4514 set_diffopt_flags_from_submodule_config(options, path);
4515 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4516 ignored = 1;
4517 options->flags = orig_flags;
4518 return ignored;
4519 }
4520
4521 void diff_addremove(struct diff_options *options,
4522 int addremove, unsigned mode,
4523 const unsigned char *sha1,
4524 const char *concatpath, unsigned dirty_submodule)
4525 {
4526 struct diff_filespec *one, *two;
4527
4528 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4529 return;
4530
4531 /* This may look odd, but it is a preparation for
4532 * feeding "there are unchanged files which should
4533 * not produce diffs, but when you are doing copy
4534 * detection you would need them, so here they are"
4535 * entries to the diff-core. They will be prefixed
4536 * with something like '=' or '*' (I haven't decided
4537 * which but should not make any difference).
4538 * Feeding the same new and old to diff_change()
4539 * also has the same effect.
4540 * Before the final output happens, they are pruned after
4541 * merged into rename/copy pairs as appropriate.
4542 */
4543 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4544 addremove = (addremove == '+' ? '-' :
4545 addremove == '-' ? '+' : addremove);
4546
4547 if (options->prefix &&
4548 strncmp(concatpath, options->prefix, options->prefix_length))
4549 return;
4550
4551 one = alloc_filespec(concatpath);
4552 two = alloc_filespec(concatpath);
4553
4554 if (addremove != '+')
4555 fill_filespec(one, sha1, mode);
4556 if (addremove != '-') {
4557 fill_filespec(two, sha1, mode);
4558 two->dirty_submodule = dirty_submodule;
4559 }
4560
4561 diff_queue(&diff_queued_diff, one, two);
4562 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4563 DIFF_OPT_SET(options, HAS_CHANGES);
4564 }
4565
4566 void diff_change(struct diff_options *options,
4567 unsigned old_mode, unsigned new_mode,
4568 const unsigned char *old_sha1,
4569 const unsigned char *new_sha1,
4570 const char *concatpath,
4571 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4572 {
4573 struct diff_filespec *one, *two;
4574
4575 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4576 is_submodule_ignored(concatpath, options))
4577 return;
4578
4579 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4580 unsigned tmp;
4581 const unsigned char *tmp_c;
4582 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4583 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4584 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4585 new_dirty_submodule = tmp;
4586 }
4587
4588 if (options->prefix &&
4589 strncmp(concatpath, options->prefix, options->prefix_length))
4590 return;
4591
4592 one = alloc_filespec(concatpath);
4593 two = alloc_filespec(concatpath);
4594 fill_filespec(one, old_sha1, old_mode);
4595 fill_filespec(two, new_sha1, new_mode);
4596 one->dirty_submodule = old_dirty_submodule;
4597 two->dirty_submodule = new_dirty_submodule;
4598
4599 diff_queue(&diff_queued_diff, one, two);
4600 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4601 DIFF_OPT_SET(options, HAS_CHANGES);
4602 }
4603
4604 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4605 {
4606 struct diff_filepair *pair;
4607 struct diff_filespec *one, *two;
4608
4609 if (options->prefix &&
4610 strncmp(path, options->prefix, options->prefix_length))
4611 return NULL;
4612
4613 one = alloc_filespec(path);
4614 two = alloc_filespec(path);
4615 pair = diff_queue(&diff_queued_diff, one, two);
4616 pair->is_unmerged = 1;
4617 return pair;
4618 }
4619
4620 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4621 size_t *outsize)
4622 {
4623 struct diff_tempfile *temp;
4624 const char *argv[3];
4625 const char **arg = argv;
4626 struct child_process child;
4627 struct strbuf buf = STRBUF_INIT;
4628 int err = 0;
4629
4630 temp = prepare_temp_file(spec->path, spec);
4631 *arg++ = pgm;
4632 *arg++ = temp->name;
4633 *arg = NULL;
4634
4635 memset(&child, 0, sizeof(child));
4636 child.use_shell = 1;
4637 child.argv = argv;
4638 child.out = -1;
4639 if (start_command(&child)) {
4640 remove_tempfile();
4641 return NULL;
4642 }
4643
4644 if (strbuf_read(&buf, child.out, 0) < 0)
4645 err = error("error reading from textconv command '%s'", pgm);
4646 close(child.out);
4647
4648 if (finish_command(&child) || err) {
4649 strbuf_release(&buf);
4650 remove_tempfile();
4651 return NULL;
4652 }
4653 remove_tempfile();
4654
4655 return strbuf_detach(&buf, outsize);
4656 }
4657
4658 size_t fill_textconv(struct userdiff_driver *driver,
4659 struct diff_filespec *df,
4660 char **outbuf)
4661 {
4662 size_t size;
4663
4664 if (!driver || !driver->textconv) {
4665 if (!DIFF_FILE_VALID(df)) {
4666 *outbuf = "";
4667 return 0;
4668 }
4669 if (diff_populate_filespec(df, 0))
4670 die("unable to read files to diff");
4671 *outbuf = df->data;
4672 return df->size;
4673 }
4674
4675 if (driver->textconv_cache && df->sha1_valid) {
4676 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4677 &size);
4678 if (*outbuf)
4679 return size;
4680 }
4681
4682 *outbuf = run_textconv(driver->textconv, df, &size);
4683 if (!*outbuf)
4684 die("unable to read files to diff");
4685
4686 if (driver->textconv_cache && df->sha1_valid) {
4687 /* ignore errors, as we might be in a readonly repository */
4688 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4689 size);
4690 /*
4691 * we could save up changes and flush them all at the end,
4692 * but we would need an extra call after all diffing is done.
4693 * Since generating a cache entry is the slow path anyway,
4694 * this extra overhead probably isn't a big deal.
4695 */
4696 notes_cache_write(driver->textconv_cache);
4697 }
4698
4699 return size;
4700 }
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